Support drag and drop of files onto the app window.
Remove the original shell implementation of drag-and-drop files on Windows.
Move the new implementation of opening the dropped files API to the platform specific client handler file so that we can convert native file paths on Windows to Unix file paths.
Fix an issue that is opening left-over files from previous failure of drag-and-drop files.
Merge branch 'master' into glenn/drag-and-drop
Merge branch 'glenn/drag-and-drop' of https://github.com/adobe/brackets-shell into glenn/drag-and-drop
Simplified drag and drop
Fix windows compile problems.
Review comments
Merge pull request #272 from adobe/glenn/drag-and-drop

Add brackets.app.getDroppedFiles() function