Change sublime text path select priority on mac.

User changed symbolic link for sublime binary is now top priority,
since this allows users to actually specify which version of sublime
they want to use. Sublime text 2 binary has higher priority over
sublime text (3) binary, since sublime text 2 is considered more
stable.
Merge pull request #1774 from kevinxucs/sublime-default-2

Change sublime text path select priority on mac.