[geometry] various changes

we agreed upon:
- removing MaybeHasTransform
- keeping isIdentity
- replacing 'By' with 'Self'

Still TBD:
- change is2D and isIdentity to read only attributes.
- should the in-place operators return the object?
- should 'invert' be 'invertSelf'?

Received on Wednesday, 11 June 2014 03:36:03 UTC