Fix formatting in the README which was causes half the page show up as code.

 * [ci skip] CI unneeded; docfix.
Use gh syntax for code.
Remove extra EOL whitespace from README.md
Update README.md with example output which includes arma's new subkey.
Add info and references on why the strange links are in requirements.txt.
Specify pysqlite>=2.6.0, and add information on using oonib without SQLite.