Rename post attributes in 4chan API scheme

except where completely braindead, like "tim", or abbreviated for no
good reason, like "com". I would change "no" to "number", but it's used
in enough places that brevity is preferrable. Plus I have the benefit of
not using coffeescript and its weird boolean literal synonyms. Fuck that
noise.

id     -> no
poster -> name
title  -> subject