Extracted interface for Email Service.
Added support for async operations to the VitreousRespository and VitreousSet implementations.
Added support for async operations to the Email Library. Remove support for attachments.
Made use of the newly added repository async methods in the Vitreous User Store
Added missing async keyword where missing on the Vitreous User Store
Added support for async operations to the SMS library.
Added async support to the Network Service Implementation
Added async support to the FIle Service implementations.
Added async support to the notifications library
Added async support to the location library
Added async support to the SMS  library