Addresses \#6: Swift location import supported

When Swift direct-url with account name, container and object name is
given that is used to import image template using
SoftLayer_Virtual_Guest_Block_Device_Template_Group service.
Removed duplication among schema by reusing `member` and `image` schema inside `memebers` and `images`
Merge pull request #66 from amol/image-import

Addresses #6: Swift location import supported