Add NullGrammar to obviate synchronous load of text grammar on start

It's also an extremely simple grammar, so we'll do less work to
initially tokenize open buffers before loading their real grammars.

src/app/atom.coffee

@@ -41,12 +41,6 @@ _.extend atom,
         packageStates[pack.name] = @atomPackageStates[pack.name]
     packageStates
 
-  loadTextPackage: ->
-    textPackagePath = _.find @getPackagePaths(), (path) -> fs.base(path) is 'text.tmbundle'
-    pack = Package.build(textPackagePath)
-    @loadedPackages.push(pack)
-    pack.load(sync: true)
-
   loadPackages: ->
     textMatePackages = []
     paths = @getPackagePaths().filter (path) -> fs.base(path) isnt 'text.tmbundle'

src/app/null-grammar.coffee

@@ -0,0 +1,9 @@
+Token = require 'token'
+
+module.exports =
+class NullGrammar
+  name: "Null Grammar"
+  scopeName: 'text.plain.null-grammar'
+
+  tokenizeLine: (line) ->
+    { tokens: [new Token(value: line, scopes: ['null-grammar.text.plain'])] }

src/app/syntax.coffee

@@ -4,6 +4,7 @@ Specificity = require 'specificity'
 {$$} = require 'space-pen'
 fs = require 'fs-utils'
 EventEmitter = require 'event-emitter'
+NullGrammar = require 'null-grammar'
 
 module.exports =
 class Syntax
@@ -14,6 +15,7 @@ class Syntax
     @globalProperties = {}
     @scopedPropertiesIndex = 0
     @scopedProperties = []
+    @nullGrammar = new NullGrammar
 
   addGrammar: (grammar) ->
     @grammars.push(grammar)
@@ -22,7 +24,7 @@ class Syntax
       @grammarsByScopeName[grammar.scopeName] = grammar
 
   selectGrammar: (filePath, fileContents) ->
-    return @grammarsByFileType["txt"] unless filePath
+    return @grammarsByFileType["txt"] ? @nullGrammar unless filePath
 
     extension = fs.extension(filePath)?[1..]
     if filePath and extension.length == 0
@@ -31,7 +33,7 @@ class Syntax
     @grammarByFirstLineRegex(filePath, fileContents) or
       @grammarsByFileType[extension] or
       @grammarByFileTypeSuffix(filePath) or
-      @grammarsByFileType["txt"]
+      @grammarsByFileType["txt"] ? @nullGrammar
 
   grammarByFileTypeSuffix: (filePath) ->
     for fileType, grammar of @grammarsByFileType

src/app/window.coffee

@@ -52,7 +52,6 @@ window.startup = ->
 
   handleWindowEvents()
   config.load()
-  atom.loadTextPackage()
   keymap.loadBundledKeymaps()
   atom.loadThemes()
   atom.loadPackages()