converted NSAutoreleasePools to @autoreleasepool blocks
re-added return statement to TestFramework/main.m
Fixed tabs/spaces in GHNSInvocationProxy

Even though they're inconsistent elsewhere...
moved comment inside autorelease block in TestsFramework/main.m
Merge pull request #4 from Yelp/basher_autorelease_blocks

Converted NSAutoreleasePools to @autoreleasepool blocks