Keka 1.1.0 rc 2

• Keka is now sandboxed (https://github.com/aonez/Keka/wiki/Sandbox)
• No RAR compression support (https://github.com/aonez/Keka/wiki/Rar-compression)
• Properly set minimum OS X version to 10.9 (Thanks to @jhzzzzz and @MaxPower85) #182
• Integrated services, replacing Automator workflows (way faster)
• Integrated services shortcuts (Thanks to @Ornataweaver for the tip) #189
• Better handling of compression/extraction process crash
• DMG creation now requires a folder input
• Partially controlling DMG progress percentage
• Polish translation updated by @lboratynski
• Italian translation updated by Vincenzo