Add missing "@synthesize" directive

Xcode5-DP complains about this being missing, though Xcode4 compiles and
runs the source without it no problem...
Add path to platform specific Ruby config.h
Correct key bindings for alt keyboard layouts

This fix uses the Unicode Utilities to check what letter is produced by
each key code in SDKeyBindingTranslator's initialize method. The values
are then stored in a NSMutableDictionary that is later used to check for
the proper key code for single character bindings. Only the subset of
key codes that can produce different characters for different keyboard
layouts are checked.
Merge branch 'alt-kb-layout' of https://github.com/jballanc/zephyros into jballanc-alt-kb-layout

Conflicts:
	Zephyros.xcodeproj/project.pbxproj
Merge pull request #32 from sdegutis/jballanc-alt-kb-layout

Jballanc alt kb layout