Fix response for array of plain objects
Merge pull request #88 from javiyu/fix_array_of_plain_objects_response

Fix response for array of plain objects
include shared templates without namespace for mongoid
adds mongodb service to travis file
updates rails 3 version
updates acts_as_api version
Refactoring: responder implementation has been  moved to a nested module
friendly to 'responders' gem.
Merge pull request #92 from bkon/master

Refactoring: responder implementation has been moved to a nested module.