Multiple features, enhancements and bug fixes

### Changes

    - Added better handling of error messages and bubbling up the error text from the service
    - Updated/Expanded documentation
    - Updated to SimpleRESTServices v1.1.1.0
    - Fixed bug on retrying trying to add the X-Auth-Token header when it already exists
    - Cloud Files
        - Added support for bulk delete of objects
        - Added support for updating and deleting container metadata
        - Added support for filtering by prefix
    - Cloud Server
        - Implemented List, Create and Delete of Virtual Interfaces
        - Implemented list server pagination filters
    - Cloud Identity
        - Added implementation for the list roles pagination filters