AccountManager: Remove method getAccountTypeList
AccountManager: Handle initialization of field availableAccountTypes
AccountManager: Change return type of getAvailableAccountTypes to a Colelction of AccountType objects
AccountManager: Make availableAccountTypes a Set instead of a List - need to guarantee uniqueness
AccountManager.getAvailableAccountTypes: Create unmodifiable copy of account types set and return that instead
AccountManager: Add TODO for account types list initialization
layout : account_type_list_textview : Increase text size for service name text
Add new class AccountTypeListAdapter - used as adapter for activity displaying account types list
Modify NewAccountTypeSelectActivity to use AccountTypeListAdapter