Polychromatic 1.1.2 – Xcode 7 support, highlighting improvements (especially for Swift)

• Improves the hashing algorithm used for coloring (thanks Simon Welker!)
• Fixes crashing in Xcode 7 preferences view (@richardjrossiii)
• Better coloring for Swift properties (@rolandleth)
• Fixes #49, where syntax highlighting fails and text turns black.

[The first three changes are rolled in from v1.1.1, which hadn't been announced yet.]

Enjoy!