Store filepaths in the database without the leading 'repo-path'.

This should now reflect a generalized path starting with the project
user/org name.
Implement basic notes API.

I've not addressed the hack bubbles, but the data functionality is
there.
Attempt to work around Windows file path separator.
Fix typo.
Implement more robust way to ensure a correct filepath across OS.
Merge pull request #48 from quality-clojure/notes-api

Notes API