Merge branch 'master' into develop
Update licensing header and module docstring for bridgedb.Time.
Remove unused Storage.SqliteDict class.
Merge branch 'hotfix/remove-sqlitedict-class' into develop
Update bridgedb.crypto module docstring.
Add docstring for crypto._createGPGMEErrorInterpreters().
Add attribute docstring for crypto.gpgmeErrorTranslations.
Rename Sphinx build source for bridgedb.util module to new module name.
Add file header and module docstring for bridgedb.parse.versions.
Fix type specifiers on b.p.versions.Version class attr docstrings.

Also add more information on the potential attribute values.
Add a doctest and fix outdated parameter refs in b.p.v.Version docstring.
Raise an error rather than printing in b.p.v.Versions.
Change attr and fmtstr types in b.p.v.Version to be comparable.

We should use ints for the `major`, `minor`, and `minor` attributes,
just like the parent class in Twisted does.
Add bridgedb.parse.__init__ to Sphinx documentation.
Update copyright year in Sphinx documentation config file.
Disable full module names for autogenerated Sphinx documentation.
Add bridge descriptor documentation to Sphinx builds.
Add link to trac.torproject.org BridgeDB tickets in Sphinx docs.
Move Sphinc doc requirements.txt into doc/sphinx/ directory.
Update bridgedb.crypto module docstring.