Switch to pip install

[weaverba137]

This PR closes #167. In addition to a simple replacement of python setup.py install with the equivalent pip install ., this PR

• Updates the known packages.
• Begins preparation for the transition to Lmod-based modules.

[coveralls]

Coverage decreased (-0.01%) to 68.032% when pulling 721fff0 on pip-install into 3ce49f0 on master.

[sbailey]

Looks good, thanks.

It looks like the pip_safe list in install.py isn't used yet. Is that correct? ok to leave it as is, or consider _pip_safe hiding it or commenting it out if not needed. Since we have a mix of packages, I like that the current method appears to automatically detect what to do rather than requiring a proactive opt-in list to be maintained, so we may never need this.

[weaverba137]

Indeed, pip_safe is "reserved for future use". I'll comment it out for now, then merge & tag.