Bump gem version to 2.40.0 + update rb/CHANGES

Author: jarib

Diff for: rb/CHANGES

@@ -1,11 +1,13 @@
-2.40.0 (???)
-============
+2.40.0 (2014-02-19)
+===================
 
 * Fix bug where FileReaper would not reap files added in a child process
 * Document AbstractEventListener (#5994)
 * Safari:
   * Add Safari::Options + clean up Safari extension handling (#6382)
   * Add support for user extensions (#6815)
+* Firefox:
+  * Support native events for Firefox 27 + removed native event support for Firefox 25
 
 2.39.0 (2013-12-17)
 ===================

Diff for: rb/build.desc

@@ -1,5 +1,5 @@
 rubygem(
-  version = "2.40.0.rc2",
+  version = "2.40.0",
   name = "selenium-webdriver",
   dir = "build/rb",
   deps = [