Display a notification when successfully installing a package

Improve wording in notification
Only display notification on successfull install
Add message to restart Xcode in notification when required
Bring Alcatraz to front when clicking notifitcation
Update README with notification functionality
Fixes #45 - Add notifications for plugin installation
Release 0.6
added version updating notice
tested that callbacks are passed with right arguments
removed whitespace
Update deploy task to set global read
Add Makefile, update ci script
Make branch usage explicit in version and update targets

- Avoid deploying before pushing all master commits or tagging on
branch other than master
Merge pull request #49 from mneorr/make

Replace Rake with Make
add clean to xcodebuild