…uction.

Differential calculations/constraints and code tidy/reorg still to do.

… it's a messy bit of code!

…olation

… however code may be useful).

Merged current development branch.

 point inside iff

added my name to AUTHORS.txt

…tetrahedra_mesh

# Conflicts:
#	AUTHORS.txt

…ource into feature/tetrahedra_mesh

…erivatives at the spline knots.

…views more. Speed up was from memory view assignments to self._a_mv not self._a (2D and 3D)

…sts from init to run only once.

… format changes.

…enerate cython annotation html files for each compiled pyx file.

…functions instead of if statement per coefficient.

…d raise ValueErrors. Unit tests are updated to properly check this.

…ns in 2D.

…ive needed.

… methods refactored in _ArrayDerivative2D.

Feature/interpolation

Added the interpolate module into __init__.py

…nto development.

Commented out a few unused code segments relating to gradients that are currently unused.

…nto development.

…nto development.

Added Simon Orchard to the contributors list.

Merge 1D, 2D and 3D array interpolators.

Add imported module lines