vim, IJulia, and module docstrings

Improvements:

• Fixes for vim users (vim seems to use a save-to-temporary-file-and-then-rename strategy when saving documents)
• Automatically trigger revisions on IJulia
• Split a module's docstring from the module (prevents what would otherwise be an attempted module redefinition)

Initial release

Merge pull request #5 from timholy/teh/include

Support tracking of `include`d files