Wrap long lines, punctuate consistently (full stops)
Tidying docs

Wrap long lines, tweak some markup, add some TODO notes,
got rid of some sphinx warnings.
Merge pull request #1604 from jean/doc-edits

Doc edits
Revert commits moved to no-secret-key and doc-edits branches
Merge branch '2.0.x' of https://github.com/GeoNode/geonode into 2.0.x
Merge branch '2.0.x' of github.com:jean/geonode into 2.0.x