Add support for Service Identities with X509Certificates and Facebook Identity Provider

* Added AddServiceIdentityWithX509Certificate to AcsNamespace
    * Support for the following parameters
       * Name
       * EncryptionCertificate (Raw Byte[] of X509)
       * StartDate
       * EndDate
    * Supports following certificate locations
       * Local Store (User or Machine)
       * Local File System
       * In Memory Certificate Bytes
 * Added underlying support to ServiceManagementWrapper
 * Added test to prove operation
* Added support for a Facebook Identity Provider
   * Including support for application permissions