Sphinx-websequencediagrams

Includes 7

Fixed a few bugs found after introducing this into the wild:

- Allowed >1 sequence diagram in multiple files
- Allowed sequence diagrams in nested files
- Re-introduced meaningful names to downloaded files
- Downloaded files never touch the source directory
- Commented code better so it can actually be understood

Initial release.

Only releasing because I want to host this on PyPI because I want to use this in another project without having to install an egg from a github repo.

Experimental features:

- Defining websequencediagrams w/in an rst directive
- Linking to a file that has a sequence diagram defined in it
- Defining themes & output formats (although idk why you'd want an inline
- Anything not mentioned above that this does

Known Issues:

- Generated images appear in `source/_static` which is most-often not gitignore-ed.
- No authorization for "premium" websequencediagram features
- Not compatible w/ non `png` output formats (it renders as an `<img>`)