Adding more features to survey and rails 4 compatible

Hello, 
I did some major changes to the gem, as following : 
Compatible with Rails 4.
Surveys can limit the number of attempts for each participant, can have multiple sections.
Sections can have multiple questions
Answers can have different weights and types (multi choices, single choice, number, text)
Can use 2 languages (Main language field, Localized field) for Surveys, Sections, Questions and Options attributes