"close others" extension.
file close functions to handle list of files.
naming convention changes
Merge branch 'master' into closeOthers2
removeFromWrokingSet() changed to handle array of files.
Merge branch 'master' into closeOthers2
Unit test added for close others
jsHint fixes
unnittest-files folder added.
Merge branch 'master' into closeOthers2
Merge branch 'master' into closeOthers2
Merge branch 'master' into closeOthers2
Integration test failures fixed
Merge pull request #4590 from sathyamoorthi/closeOthers2

"close others" extension added to default extensions directory.
Merge branch 'master' of https://github.com/adobe/brackets