Adding support for format rendering of fiscal quarters (with tests).

Adds tokens 'Q' and 'QQ' to format code for outputting fiscal quarter (e.g. "Q3"). See the test cases in 'test/moment/format'. This was useful for me in a recent project.

Also note that I had to change the use of UglifyJS in the 'mincomment' grunt task, which was throwing an error with the "latest" (2.x) version of UglifyJS as specified in package.json. I considered changing the dependency to 1.x which worked, but instead just changed it to the new API. You don't have to accept that commit (bc170a5).