Add scipy and reduce number of build configurations to a minimum

The immediate goal is to simply get a travis build running.
Remove unused pylab import
Try pip upgrading scipy
Try testing using wheels for most dependencies
Try a build matrix with wheels
Exclude some numpy/python combinations from build matrix
Try installing python if building development
Continuing the random walk towards correct development build...
Change variable names and try sphinx build
Fix pip commands
Prevent sphinx warnings from generating errors
Try building exclusion list as an array
Array thing didn't work
Build matrix with minimal additional installs
Try an array of numpy versions
Last trial version before sharing more widely...
One more try....
Say yes to uninstalls
Try --upgrade instead of uninstall
Try --force-reinstall

When did travis start including numpy, anyway?!