Counting Cells working!
Faces!
Testing and Face numbering (shared faces are shared!)
Removed FAST COUNTING for EASY COUNTING
Divergence Operator (structure)
col area and correct divergence calculation.
Updates to visualization, gridCC, and refine functionality
Visualization.
Merge branch 'develop' of https://github.com/simpeg/simpeg into quadtree

Conflicts:
	SimPEG/__init__.py
Grid updates for TreeMesh, initial generalizations for OcTree
pointer testing and nodes!
refactoring and visualization
testing octree
Sharing of nodes in OcTree
Ascii drawing skillz
counting and linking xFaces
count and link Y faces
Count and link Z faces
refactor quad tree face numbering
Switch to Edges (few bugs in the refinement code..)