New feature: Added initial messages for validation PM
New feature: Added initial Validation_Message
Updated feature: Now messages can be sent or saved
Fixed feature: Changed method name visibility

// @sandeep
+ May be Validation_Message::exists should be moved to
User::exists class?
+ May be should use User::lookup_by_name instead
Validation_Message::exists?
Fixed issue: Cleanup indents
Fixed issue: Improved rule
Fixed issue: Used Model's rules instead Validation class
Merge pull request #688 from sergeyklay/feature-bootstrap-3

Updated PM feature