Configuring for rake test DB=mysql

Gemfile

@@ -26,6 +26,7 @@ group :test do
   platforms :ruby do
     gem 'pg'
     gem 'sqlite3'
+    gem 'mysql2'
   end
 
   platforms :jruby do

test/database.yml

@@ -6,7 +6,7 @@ sqlite:
 mysql:
   adapter: mysql2
   database: geocoder_test
-  username:
+  username: travis
   encoding: utf8
 postgres:
   adapter: postgresql