margin fix
added "randomFloat"
added 'perpendicular' and 'truncateLength:' methods, normalize is now safe
added factory methods
SP_RELEASE_AND_COPY fix
added uniform scale property
added SP_PHYSICS_CLASS define

if SP_PHYSICS_CLASS is defined before importing Sparrow headers you can
access the property without having to cast to the specific class…
Merge pull request #22 from Gamua/master

Gamua additions
updated copyright dates
GLKView convenience property
removed drawable width/height properties
comment clarity
cleanup
fix, missed a previous commit
fixed some analyzer warnings
Merge pull request #31 from racarone/master

Minor Additions and Cleanup