replaced id with instancetype for methods that return an instance of the receiving class’s type
now using NS_ENUM for enums
replace literal string macros with NSString const*
removed all unnecessary @synthesize
optimized render state stack
SPTouch now retains target (closes #16)
extern strings now reflect their name
blend modes are now extern const uint
disable blend completely on SPBlendModeNone
text field exern const replacements
method fomatting is now consistent
colors are now extern const uints
macro -> const fix
SP_SQUARE vs SQ and square
SPPoolObject modifications

optionally threadsafe, no longer requires subclasses to implement the
SP_IMPLEMENT_MEMORY_POOL() macro, uses a static hash table of queues
instead
Merge pull request #17 from racarone/constants

merging changes that replace macros with constants where possible & coding style consistency
safer hash function and naming changes
yet another workaround for a GLKTextureLoader bug
Merge pull request #18 from racarone/atomic-pool

SPPoolObject modifications
added 'speed' property to SPJuggler