Fix Live Development issues with Chrome OSX

This reverts commit 2f543d2b7b8cdfebd66aac843b147881bd8c2597, reversing
changes made to c8e714d2961d9a045f74fc55605f49c0b66637fc.
Also fixes issue with invalid SBApplication object causing Brackets to
hang on close.
Simplify open/close LiveBrowser methods
Merge pull request #382 from fungl164/osx-live

Fix Live Development issues with Chrome OSX (round 2)