Fix FormBuilder error when no Sprockets installed.

Sprockets was built-in since Rails 3.1.
Do not include Sprockets helpers if it's not defined.
Merge pull request #40 from bootleq/sprockets

Fix FormBuilder error when no Sprockets installed.
With this Rails 4 can be used too without the set_table_name error.
Adding translation messages that are missing in the README.rdoc
Merge pull request #43 from arthurmolina/master

Compatibilty with Rails 4
merge conflict Sprockets
merge conflict: set table name
Dummyapp and integration tests added; SimpleCaptcha.always_pass = Rails.env.test? extracted
additional test with model based methods
travis.ci first try
ruby 1.9.3
Also added pg and mysql to test spec
mysql2 instead of mysql
Dummy app not static anymore: rake task for dynamic generation of dummy app
removed dummy app from VCS
finalized dummy rake task and travis build command
Formtastic version 2.2 and Rails 3.2 tested and supported with new custom input.
attr_protected only for Rails 3
mysql support
Merge remote-tracking branch 'upstream/master'