added:

- Account Store Mappings resource
- account store mappings methods to Application resource
- added sample code

know issues:
- Application.createAccountStoreMapping is useless, because you can not create Account Store Mapping directly
Merge branch 'master' into account_store_mapping

Conflicts:  example.js
updated AccountStoreClassFactory
updated Application.createAccountStoreMapping method
added AccountStoreMapping resource docs
added docs for AccountStoreMapping functionality in Application resource
add AccountStoreMapping Resource tests
add Application Resource tests
store to map
Merge pull request #1 from valorkin/account_store_mapping

Temp