Add RTD requirement for scipy
Merge pull request #28 from mwcraig/fix-rtd2

Add RTD requirement for scipy
Many more test builds, most using wheels

This vastly reduces the build time even though the total number of tests is larger. Closes #7
Remove unused pylab import
Merge pull request #29 from mwcraig/full-travis-matrix

Many more test builds, most using wheels