v.1.0.2 - Reliability improvements

* Fixed a bug that prevented Handoff to be enabled in the System
Preferences, even after a successful patch (#21, #31)
* Added a backup step for freshly patched drivers, potentially useful
if a future OS X update disables the patching methods
* Added a prompt in case existing backups are found, asking whether to
overwrite the files or skip. Previous behaviour was to silently
overwrite.
* Removed the 13" MacBook Pro 2010 from the compatible list (#28, pull
#29)
* Minor optimisations