- Modified the node XRandR add-on to return the available screen
resolutions as an array of JSON objects, rather than strings.
- Refactored the XRandR bridge code into a fluid component.
- Updated the unit tests in light of the above.

Modified "screen-resolution" payload to now contain:
- "current-resolution" (width and height)
- "available-resolution" (array of widths and heights).

Modified to be analagous to the Windows display settings handler.

Remvoed {that} parameter from get() and set() functions.

Added machinery for providing a Linux/GNOME Platform Reporter that
uses the XRandR display settings handler to report all screen resolutions.

Note:  includes code from pull request for GPII-2395, "XRandR bridge should
report all available screen resolutions".

Fixed description in package.json.

Fixed bug so that GPII finds the Linux context platform reporter.

…version

Modified to reference the version of universal just prior to
incorporating Kasper's GPII-1230 code, which introduced functionality
not yet implemented in the linux repository.

Includes updating to latest master branch.