Fix bug in bicubic interpolation and extend test cases to higher orders
Add reference to bicubic interpolation
Make code PEP8 compliant
Fix reference syntax
Fix broken test case, which used black image
Fix bug in get_pixel3d
Fix quadratic interpolation
Use SciPy for second order interpolation, add warnings to buggy functions
Remove broken test case
Merge pull request #1051 from ahojnnes/bicubic-interp

Bicubic interpolation fix and reference