Some docs about general math terminology
Started documenting extrapolation
Clarify my idea for the type hierarchy
Skeleton writeup
Constant, linear and (broken) quadratic interpolation
Add missing file (and fix implementation of quadratic)
Update example usage notebook
Generic, macro-based prefiltering
Reworked prefiltering
Better warning message when A is not concrete
Updated notebook => tutorial of sorts
Do away with coords2lin
Make tests pass
Update documentation after BC restructuring
Added missing file
Merge pull request #4 from tlycken/doc

Rewrite with clear separation of concerns (closes #2)