Merge pull request #86 from loicfrering/master

Add Backbone.Datagrid to the stack
[maven-release-plugin] prepare release resthub-2.0.0
[maven-release-plugin] prepare for next development iteration
update populateModel in order to properly manage radio and checkbox groups
first implementation of ResthubValidation mechanisms
end of ResthubValidation implementation, management of locales and options, client side definition overrides
move to Resthub.Validation
fix error Backbone.ResthubValidation -> ResthubValidation
group options into options object, implement parameters for custom messages, add support fot NotBlank and NotEmpty and fix bugs
update client messages management to remove keyOnly option and allow to mix server localized messages, global client messages and model specific messages
Revert "[maven-release-plugin] prepare release resthub-2.0.0"

This reverts commit 4771334e3ea64164bf9520723670f57eb5926f7d.
[maven-release-plugin] prepare release resthub-2.0.0
[maven-release-plugin] prepare for next development iteration
fix some url bugs and start implementing unit tests for validation : test urls validation
fix bugs in validation custom messages, change credit card number validator and add tests
fix bugs on locale changed and implement last tests
implement error management and corresponding tests
change maven version to 2.1.0-SNAPSHOT and typo fixes
refactor to hide validators
typos fixes