Fix matplotlib install, make installs verbose, add spacers
Fix typo in spacer declaration
Merge pull request #1128 from blink1073/fix-travis

Fix travis build for python 3.2
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