Use MiniConda for setting up dependencies
Install all sphinx dependencies, and test old Numpy versions only with Python 2.7
Add python 3.2 build
Simplify miniconda installation and always point to latest version
Make miniconda.sh executable
Add back Python 3.2 with an old Numpy version
Update channel name
Try and simplify Travis file by setting default for NUMPY_VERSION and OPTIONAL_DEPS
Merge pull request #2415 from astrofrog/use-miniconda-for-travis

Use MiniConda for setting up dependencies