SPPoolObject modifications

optionally threadsafe, no longer requires subclasses to implement the
SP_IMPLEMENT_MEMORY_POOL() macro, uses a static hash table of queues
instead
safer hash function and naming changes
Merge pull request #18 from racarone/atomic-pool

SPPoolObject modifications
added 'speed' property to SPJuggler
juggler now uses NSMutableOrderedSet vs NSMutableArray

much faster testing for inclusion, same iteration speed
juggler speed fix
preventing juggler speed < 0
added test for speed property of juggler
Merge branch 'master' of github.com:Gamua/Sparrow-Framework
removed redundant code, made benchmark finish faster
readability changes and performance enhancements
replaced GLKTextureLoader completely, now loading all textures manually.

That class caused numerous problems in the past, especially concerning premultiplied alpha. Apple somehow managed to change its behaviour in every single iOS release ... :|
added factory method to SPRectangle
deactivated mipmaps for TrueType textfields (for faster textfield creation)
added new classes to main Sparrow header file
fixed that new SPAVSoundChannel did not obey master volume
removed all non-threadsafe pooling code.

It's now fast enough to default to the safe version.
Merge pull request #14 from Gamua/master

merge