WIP: Parallelize specs tasks

.travis.yml

@@ -4,9 +4,11 @@ git:
 env:
   global:
     - ATOM_ACCESS_TOKEN=da809a6077bb1b0aa7c5623f7b2d5f1fec2faae4
-    
+
   matrix:
     - NODE_VERSION=0.12
+    - ATOM_SPECS_TASK=packages
+    - ATOM_SPECS_TASK=core
 
 os:
   - linux

build/tasks/spec-task.coffee

@@ -131,7 +131,15 @@ module.exports = (grunt) ->
       else
         async.parallel
 
-    method [runCoreSpecs, runPackageSpecs], (error, results) ->
+    specs =
+      if process.env.ATOM_SPECS_TASK is 'packages'
+        [runPackageSpecs]
+      else if process.env.ATOM_SPECS_TASK is 'core'
+        [runCoreSpecs]
+      else
+        [runCoreSpecs, runPackageSpecs]
+
+    method specs, (error, results) ->
       [coreSpecFailed, failedPackages] = results
       elapsedTime = Math.round((Date.now() - startTime) / 100) / 10
       grunt.log.ok("Total spec time: #{elapsedTime}s using #{concurrency} cores")