Classes for contact and group in contact list added
Tests renamed
* Property in XBContact class renamed
* Groups array not compared in method isEqual to prevent endless recursion
* Test with comparison two groups added
Contact list object add and made some changes in contact and group objects
Project classes structure was simplified
Files with test were removed
These string were changed by mistake
Methods for validation were added
Protocol for validators added
Required validator with tests
Method for validation is required
Class validator and string length validator
Email validator
Correct error code added
Min and max value validators were added, project file updated
Validators were added to account and tested
Interface of account manager
Project cleaned
Localization was enabled. IDs of two strings were changed
English localization file