Added getOptions method and added documention in the README for it

getOptions is meant to make persistence easier and returns:
    angle
    maintainAspectRatio
    rot-origin
    scaleLimit
    scalex
    scaley
    x
    y
Fixed typo in README on using getBounds
Merge pull request #16 from joshsziegler/master

Adds getOptions method and fixes typo in README