Doesn't work at all for git repos

[rcarmo]

I'm doing some basic testing, and apparently you're not allowing for revision ids with more than 3 characters (actually, just saw that you're using int as a revision type in the database - that won't work at all).

There might be more issues, but I've hit upon that one right away.

Removing the "int" specifier from the revision field in db.py appears to fix that across the board, in the sense that I now get a listing of the comments I made.

They still don't display, though, but I think the reason for that is #14.