Add Xcode project to ease development.
[FIX] Remove unused nilIsNull function.
Delete old JRErr 0.0.11 to make room for JRErr 2.0.0b1.
Squashed 'cocoa/dependancies/JRErr/' content from commit fe45a21

git-subtree-dir: cocoa/dependancies/JRErr
git-subtree-split: fe45a21e07640c1713fce2d023678a191ae55647
Merge commit '220c92066580cddf53f0348293c4adb0e969d410' as 'cocoa/dependancies/JRErr'
Make LichCocoa ARC compatible. Avoids weird link-time error between non-ARC client of JRErr and ARC JRErr.
Update Rakefile to handle JRErr 2.x.
[VERSION] 0.3.
[FIX] Change parsedSize type from size-shifting NSUInteger to uint64_t.
Add NSString, NSNumber and NSData marshaling helper methods.
Add Ruby support for Lich using Ragel