Mention that ThisPAN does need some dependencies installed before it can run.
Fix bad method calls to warningf, fixes GH #13
Fix bad method calls to errorf.
Deployment instructions for the web app.
Reorganize example configs, create an example PSGI script, reword deployment hints.

Obsoletes PR #18.
Allow filtering on dependencies only or reverse dependencies only.
Fix issue where not having a callback to fire crashed the whole application.
Allow dependency injection of the indexer, for custom workflows.
I thought version->parse could handle undefs, but I was mistaken.
Add a logging statement.
Add a couple hooks.
Fix GH #20 ?
Fix GH #15.
Add flushed footer so the bottom-most text is not flush to the viewport edge.
Bump version number.
Merge branch 'devel'