Added support for older OS X releases back to 10.6 included.

Apart from turning off Auto Layout for the Demo project, the only
thing remaining was several __weak qualifiers to prevent retain
cycles in blocks. I have replaced them with __unsafe_unretained
since __weak is not supported on 10.6. There should be no safety
concerns here, since we are certain the pointers will remain valid.

0 files changed, 0 insertions, 0 deletions