Added nD to Survey.BaseRx
Documentation updates for forward problem.
Newton Root solver updates
Rename model builder stuff to not be EC centric. Added an ellipse function.
Update reference model parameter.
Merge branch 'master' of https://github.com/simpeg/simpeg into cylClean

Conflicts:
	SimPEG/Survey.py
Resolve conflict.. (whoops..)
Updates to CylMesh. Innerproducts. Remove getMass.