Use released mysql2

Gemfile

@@ -90,7 +90,7 @@ platforms :ruby do
   group :db do
     gem 'pg', '>= 0.18.0'
     gem 'mysql', '>= 2.9.0'
-    gem 'mysql2', '>= 0.4.0', github: 'brianmario/mysql2'
+    gem 'mysql2', '>= 0.4.0'
   end
 end
 

Gemfile.lock

@@ -19,12 +19,6 @@ GIT
       qu (= 0.2.0)
       redis-namespace
 
-GIT
-  remote: git://github.com/brianmario/mysql2.git
-  revision: 4d76557499b762d5a62aebb7f6a56510ad221eab
-  specs:
-    mysql2 (0.4.0)
-
 GIT
   remote: git://github.com/mikel/mail.git
   revision: 64ef1a12efcdda53fd63e1456c2c564044bf82ce
@@ -209,6 +203,7 @@ GEM
     multi_json (1.11.2)
     mustache (1.0.2)
     mysql (2.9.1)
+    mysql2 (0.4.0)
     nokogiri (1.6.6.2)
       mini_portile (~> 0.6.0)
     nokogiri (1.6.6.2-x64-mingw32)
@@ -318,7 +313,7 @@ DEPENDENCIES
   minitest (< 5.3.4)
   mocha (~> 0.14)
   mysql (>= 2.9.0)
-  mysql2 (>= 0.4.0)!
+  mysql2 (>= 0.4.0)
   nokogiri (>= 1.4.5)
   pg (>= 0.18.0)
   psych (~> 2.0)