Implemented the Get-Printer-Attributes operation
Removed unnecessary printer_uri arguments
Implemented the CUPS-Get-Devices operation
Merge pull request #15 from sbellem/uri-related-corrections

Removed unnecessary printer_uri arguments
Merge pull request #16 from sbellem/cups-get-devices

Implemented the CUPS-Get-Devices operation
Merge pull request #14 from sbellem/get-printer-attributes

Implemented the Get-Printer-Attributes operation
Fixed group tag name for printer object
Merge pull request #18 from sbellem/ipptoolfile-group-tags

Fixed group tag name for printer object
Added support for requesting-user-name paramter
Added parameter printer_uri in test
Merge pull request #23 from sbellem/develop

Improvements to Get-Jobs Operation
Implemented Pause-Printer Operation
Implemented Resume-Printer Operation
Re-implemented Pause/Resume-Printer operations using functools
Added support for member_uris parameter in cups_add_modify_class
Merge pull request #24 from sbellem/issue_19

Added support for member_uris parameter in cups_add_modify_class
Merge pull request #33 from sbellem/pause-resume-printer

Implementation of Pause-Printer & Resume-Printer operations
Added missing import for functools
Merge pull request #34 from sbellem/add-missing-import

Added missing import for functools
Added support for the parameter printer-op-policy