splits the unit tests into unit and integration (the split is primarily around
whether a test opens a new Brackets window or not). There are some
tests remaining as unit tests that we may still want to categorize as
integration (nativefilesystem, for example)
remove unnecessary file
Merge branch 'master' into dangoor/testsplit

Conflicts:
	test/spec/JSUtils-test.js
Merge pull request #2859 from adobe/dangoor/testsplit

Fixes 2747, split unit and integration tests