Merge pull request #49 from gregharding/master

Corrected spelling Eular to Euler.
added a couple convenience extensions
formatting
fixed an oopsie on Android when loading GoSplines from disk.
fixed a bug with trying to play a completed tween.
skipDelay was missing implementation across goTo(), restart() and rewind() for GoTweens.
minor optimizations
fixed build error for windows phone 8
Merge pull request #51 from kwnetzwelt/master

fixed build error for windows phone 8