Updated CHANGELOG anb build tasks in advance of the 0.8.0 release.

Author: jdantonio

CHANGELOG.md

@@ -1,5 +1,7 @@
 ### Next Release v0.8.0 (25 January 2015)
 
+* C extension for MRI have been extracted into the `concurrent-ruby-ext` companion gem.
+  Please see the README for more detail.
 * Better variable isolation in `Promise` and `Future` via an `:args` option
 
 ## Current Release v0.7.2 (24 January 2015)

Rakefile

@@ -81,8 +81,9 @@ end
 task :clean do
   rm_rf 'pkg/classes'
   rm_rf 'tmp'
-  rm_rf 'lib/1.9'
-  rm_rf 'lib/2.0'
+  rm_rf 'lib/concurrent/1.9'
+  rm_rf 'lib/concurrent/2.0'
+  rm_rf 'lib/concurrent/2.1'
   rm_f Dir.glob('./**/*.so')
   rm_f Dir.glob('./**/*.bundle')
   rm_f Dir.glob('./lib/*.jar')