Improving README.
Touched by Xcode 4.6.
Incrementing version.
Removing support for GC.
Fixing static analyzer issue.
Adding JXArcCompatibilityMacros.
Preparing for ARC using JXArcCompatibilityMacros.
Replacing uses of NSAutoreleasePool with macro in JXArcCompatibilityMacros.
Adding autorelease pools for newly introduced, potentially large autoreleased allocations.
Always use @autoreleasepool when compiling with Clang.
This will not work in all cases, but is good enough for now.
Fixing typo.