* Changed "index" to be more similar to the README (#1708).
* Fixes numerous issues like missing documents, syntax errors, etc (#1829, #432).
* Mention all docs in "contents.rst" so it's easier for users to locate (#1112).
* Add doc generation and checking to Travis and AppVeyor, to avoid re-introducing errors.
Fixes#432, Fixes#1112, Fixes#1708, Fixes#1829