Beta 0.5.0

[FIX]
aspect issue.

Beta 0.4.0

[ADD]
add preview image handler

[FIX]
Semaphore / Queue instance issue
disable force autoLighting
frame rate issues

Beta 0.3.0

[ADD]
init?(withARSCNView: ARSCNView, options: Options) throws
Because need view bounds for to fix aspect issue.

[FIX] memory leak (by @okaris )
#8

[FIX] rename method
finisheWriting -> finishWriting