PSGI/View.pm: comment about weakening $self in template_functions_for_timeline(). I think it's not necessary, but it's safer to weaken it.
delete MANIFEST from repo. it's not necessary.
update .gitignore to include MANIFEST
Rename Filters to Filter::Common, because we'll have Filter::Twitter.
Add skeleton of Filter::Twitter. t/Input_Twitter.t is copied to t/Filter_Twitter.t. I'll fix it.
Input::Twitter is gonna be replaced by Net::Twitter::Loader and BusyBird::Filter::Twitter