Add RestKit to Project

Add RestKit library and instruction, which describes installation
Create classes for data mapping from json
Add function createMapping for class DMArrivalCountries
add function createMapping for DMDepartureAirports
add function createMapping for DMDepartureCities
add function createMapping for DMDepartureCountry
refactor loadData method

Extract method setupRKKit in CitiesManager and place in class init
method.

Add some controls to xib.
Add function (NSArray*) getDestinationForDeparture:(NSString*) byText

Add this function.

Add mapper for map DataObjects to Destination
Add function for - (NSArray*) getDestinationsForReturn:(NSString *)byText
Refactoring, fix bugs
Bug fixes

- (NSArray*) getDestinationsForReturn:(NSString *)byText - work
correctly.

- (NSArray*) getDestinationsForDeparture:(NSString *)byText - work with
bugs, because doesn't work mapping for DepartureAirports
fix bug

Fix bug with mapping departure airport
Merge pull request #1 from BrandyMint/CAManagerLib

Ca manager lib