normal_direction() body and developer notes
adding documentation pip requirements file
Merge branch 'cpp-refactor'
removed utility module for now
fixed issue 1, broke extension velocities
Extension velocities are found when freezing a point.

Renamed some functions. An order one method is used to initilize the narrow band now.
Adding mock object for c module for readthedocs.org
Add test cases: shows extension_velocities() bug
fixed extension velocities, added test
documentation for extension_velocities()
doc clean-up
extension velocities example

extension velocities can now marchout a negative speed

test code cleanup
update profile script
moved some functions inline for speed.

The cpp-refactor branch introduced a %20 performanc regression. This is fixed now.
added tolerance to extension test
changes for readthedocs.org
minor change for RTD
More RTD changes
adding numpy mock for RTD
adding fipy comparion, work in progress