Include READMEs in cabal sdists.

Closes #79.

concurrency/concurrency.cabal

@@ -13,58 +13,6 @@ description:
   already familiar with concurrent Haskell, just change all the
   imports from Control.Concurrent.* to Control.Concurrent.Classy.* and
   fix the type errors.
-  .
-  A brief list of supported functionality:
-  .
-  * Threads: the @forkIO*@ and @forkOn*@ functions, although bound
-    threads are not supported.
-  .
-  * Getting and setting capablities.
-  .
-  * Yielding and delaying.
-  .
-  * Mutable state: STM, @MVar@, and @IORef@.
-  .
-  * Atomic compare-and-swap for @IORef@.
-  .
-  * Exceptions.
-  .
-  * All of the data structures in Control.Concurrent.* and
-    Control.Concurrent.STM.* have typeclass-abstracted equivalents.
-  .
-  * A reimplementation of the
-    <https://hackage.haskell.org/package/async async> package,
-    providing a higher-level interface over threads, allowing users to
-    conveniently run @MonadConc@ operations asynchronously and wait
-    for their results.
-  .
-  This is quite a rich set of functionality, although it is not
-  complete. If there is something else you need, file an issue!
-  .
-  This used to be part of dejafu, but with the dejafu-0.4.0.0 release,
-  it was split out into its own package.
-  .
-  == Why this and not something else?
-  .
-  * Why not base: like lifted-base, concurrency uses typeclasses to
-    make function types more generic. This automatically eliminates
-    calls to `lift` in many cases, resulting in clearer and simpler
-    code.
-  .
-  * Why not lifted-base: fundamentally, lifted-base is still using
-    actual threads and actual mutable variables. When using a
-    concurrency-specific typeclass, this isn't necessarily the case.
-    The dejafu library provides non-IO-based implementations to allow
-    testing concurrent programs.
-  .
-  * Why not IOSpec: IOSpec provides many of the operations this
-    library does, however it uses a free monad to do so, which has
-    extra allocation overhead. Furthermore, it does not expose enough
-    of the internals in order to accurately test real-execution
-    semantics, such as relaxed memory.
-  .
-  See the <https://github.com/barrucadu/dejafu README> for more
-  details.
 
 homepage:            https://github.com/barrucadu/dejafu
 license:             MIT
@@ -74,7 +22,7 @@ maintainer:          mike@barrucadu.co.uk
 -- copyright:           
 category:            Concurrency
 build-type:          Simple
-extra-source-files:  CHANGELOG.markdown
+extra-source-files:  README.markdown CHANGELOG.markdown
 cabal-version:       >=1.10
 
 source-repository head

dejafu/dejafu.cabal

@@ -18,43 +18,6 @@ description:
   <https://hackage.haskell.org/package/concurrency concurrency>
   package by enabling you to systematically and deterministically test
   your concurrent programs.
-  .
-  == Déjà Fu with 'IO':
-  .
-  The core assumption underlying Déjà Fu is that any apparent
-  nondeterminism arises purely from the scheduling behaviour. To put
-  it another way, a given computation, parametrised with a fixed set
-  of scheduling decisions, is deterministic.
-  .
-  Whilst this assumption may not hold in general when 'IO' is
-  involved, you should strive to produce test cases where it does.
-  .
-  == Memory Model
-  .
-  The testing functionality supports a few different memory models,
-  for computations which use non-synchronised `CRef` operations. The
-  supported models are:
-  .
-  * __Sequential Consistency:__ A program behaves as a simple
-    interleaving of the actions in different threads. When a CRef is
-    written to, that write is immediately visible to all threads.
-  .
-  * __Total Store Order (TSO):__ Each thread has a write buffer. A
-    thread sees its writes immediately, but other threads will only
-    see writes when they are committed, which may happen later. Writes
-    are committed in the same order that they are created.
-  .
-  * __Partial Store Order (PSO):__ Each CRef has a write buffer. A
-    thread sees its writes immediately, but other threads will only
-    see writes when they are committed, which may happen later. Writes
-    to different CRefs are not necessarily committed in the same order
-    that they are created.
-  .
-  If a testing function does not take the memory model as a parameter,
-  it uses TSO.
-  .
-  See the <https://github.com/barrucadu/dejafu README> for more
-  details.
 
 homepage:            https://github.com/barrucadu/dejafu
 license:             MIT
@@ -64,7 +27,7 @@ maintainer:          mike@barrucadu.co.uk
 -- copyright:           
 category:            Concurrency
 build-type:          Simple
-extra-source-files:  CHANGELOG.markdown
+extra-source-files:  README.markdown CHANGELOG.markdown
 cabal-version:       >=1.10
 
 source-repository head

hunit-dejafu/hunit-dejafu.cabal

@@ -11,9 +11,6 @@ description:
   <https://hackage.haskell.org/package/HUnit HUnit>. This lets you
   easily incorporate concurrency testing into your existing test
   suites.
-  .
-  See the <https://github.com/barrucadu/dejafu README> for more
-  details.
 
 homepage:            https://github.com/barrucadu/dejafu
 license:             MIT
@@ -23,7 +20,7 @@ maintainer:          mike@barrucadu.co.uk
 -- copyright:           
 category:            Testing
 build-type:          Simple
-extra-source-files:  CHANGELOG.markdown
+extra-source-files:  README.markdown CHANGELOG.markdown
 cabal-version:       >=1.10
 
 source-repository head

tasty-dejafu/tasty-dejafu.cabal

@@ -11,9 +11,6 @@ description:
   <https://hackage.haskell.org/package/tasty tasty>. This lets you
   easily incorporate concurrency testing into your existing test
   suites.
-  .
-  See the <https://github.com/barrucadu/dejafu README> for more
-  details.
 
 homepage:            https://github.com/barrucadu/dejafu
 license:             MIT
@@ -23,7 +20,7 @@ maintainer:          mike@barrucadu.co.uk
 -- copyright:           
 category:            Testing
 build-type:          Simple
-extra-source-files:  CHANGELOG.markdown
+extra-source-files:  README.markdown CHANGELOG.markdown
 cabal-version:       >=1.10
 
 source-repository head