First version of sections on color and exposure.
Minor corrections
Enhancements to the text
Fix bug in bicubic interpolation and extend test cases to higher orders
Add reference to bicubic interpolation
Make code PEP8 compliant
Fix reference syntax
Modified the order of API docs page so that table of contents is always
at the top (following #880)
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
Over and underline alignment
Removed seealso field that was not recognized in gallery example
Add a script to create env variables and travis folding helpers

Implement travis folding helpers

Add a script to create env variables and travis folding helpers

Implement travis folding helpers

Source all of the shell scripts

Remove  since we are sourcing

Fix syntax of travis fold commands

Put the travis folds in the individual files

Put the min test and flake in their own files

Reinstate top level venv activation

Remove unused script commands

Fix travis_fold syntax
Switch to a single script to get the folds to work

Switch to a single script to get the folds to work

Replace the old install_min with this before_install script

Reinstate optional installs and add headers

move the display setup to the travis_script

Use force remove on temp directory

Always retry on pip

Fix the travis_retry pip alias

Source the before_install script and move the alias

Create bash functions for folding and export DISPLAY

Export fold functions

Make repip a function
Use our own retry command since travis_retry is not exported

Use our own retry command since travis_retry is not exported

Reinstate the MPL settings

Fix the order of the MPL settings

Fix the MPL versions

Streamline the section headers

Adjust min MPL requirement for the Ubuntu version

Force pip to not install matplotlib and scipy
Use the system python for 2.7
Do not explicitly remove packages from requirements.txt