Merge pull request #36 from SevenBits/stable

Stable
Updated Sparkle framework and fixed an error when checking for updates.
Merge branch 'working' of https://github.com/SevenBits/Mac-Linux-USB-Loader into working
Update README.
Programmatically set application version number in About window to the value from our Info.plist.
Moved around some icon files and eliminated some duplicates.
Slight updates to GUI.
Partially localized to USBDevice.
Update main.m
Initial Commit
Merge remote-tracking branch 'GitHub/working'
Repository fix.
Added Greek translation, courtesy of @Mitsos101.
Updated Greek translation.
Create CONTRIBUTIONS.md
Delete CONTRIBUTIONS.md
Create CONTRIBUTING.md
Updates for OS X 10.10 SDK
Set a custom message for the bless authorization dialog.
Update Linux Mint and Zorin download URLs and remove Italian localization.