convert all docs to numpy style

[orbeckst]

According to our Style Guide, all doc strings should be in written with the numpy doc formatting. All new docs are being written according to this style (and for an example see the numpy doc/example.py).

Old docs need to be manually converted:

• core library: see PR Minor fixes #1247 (@jbarnoud)
• analysis module: see PR transition analysis docs to numpy style #1240 (@orbeckst)
• visualization module: TODO

[orbeckst]

@tylerjereddy could you have a look at your code in visualization to update the docs to numpy style when you have a moment? Thanks.

[orbeckst]

@tylerjereddy ... or if you can find someone willing to do it (new contributors, anyone?) feel free to delegate. But all in visualization is your code so I think you should at least review any changes there.

[kain88-de]

Are all docs now really numpy style?

[orbeckst]

I think so... always possible that we missed something, of course.

Just did a

git grep :Keywords:

and got

MDAnalysis/analysis/contacts.py:        :Keywords:
MDAnalysis/coordinates/PDB.py:        :Keywords:
MDAnalysis/core/topologyobjects.py:        :Keywords:
MDAnalysis/core/topologyobjects.py:        :Keywords:

so probably a few stragglers that need to be mopped up.