Merge pull request #53 from simpeg/develop

Merge Develop into Master
Major updates to innerProducts documentation
updates/typos in docs
Merge pull request #60 from simpeg/develop

Merge Develop and Get rid of develop.
docs updates and notation changes
Added option to invert the material property.
setup.py
tolerance on test
changed matutils to handle vector material properties not just columns
updates to face innerProducts

Increase Speed
Add derivatives
Add tests
Edge inner products are derivatives w/ testing.
Updated linear inversion
bug fix for windows compatability on solver.
bug fix n --> vnC
make modelPair be OK in problem if first ComboModel is the right one.
change n --> vnC in cellGradz
change modelObj2Deriv from (self) --> (self, m, v=None)
Had to change location of _bfgsH0 calculation, which now actually works.
Documentation for taking the derivatives of innerProducts
Full anisotropic tensor derivatives.
refactoring and documentation for innerProducts