added OSX save transfer support + standalone shell scripts

I've hacked together OSX save transfer support, seems to work fine for me.

I also found it a little annoying to run the whole tool every time just to transfer saves, so I added two shell scripts that can be run from terminal simply with sh ./osx-push-steam-saves.sh or sh ./osx-pull-android-saves.sh. Might be nice to do the same for windows users one day or improve the tool so you can shortcut to that part quickly.

Full changes:

1. ADB support for OSX
2. Disable BACKUP for OSX - xcopy isn't working, maybe I'm missing something simple
3. Save transfers to and from android/steam works within tool
4. Slight readability/code duplication refactor for profile saves

Relevant issue: #82