Added development group into JShrink test suite

This makes it simpler to isolate code that’s being worked on- simply
create the test cases in the Development directories and run the tests
with the development group and phpunit will focus on just that
development case.
Fixed prefix_increment.js to be valid javascript
Added test case for ending comments

There had been some bugs related to last line comments, and this checks
to make sure those bugs never reappear.
Improved support for conditional comments and smarter newlines
Additional tests from the minify suite

That’s to MrClay for submitting these.
Formatting fixes
Merge pull request #33 from tedivm/testing_updates

Additional Tests, Improved Conditional Comment Support