Move some code into Gather()

Will be useful when playing with WSGIREF
Forgot one chunk of code in previous commit
Remove useless 'socket' dependence
Raise MorssExceptions in morss.py

Cleaner
Add "al" (apparent limit) param with value

Removes element from rss *after* treatment, useful for slow json API
Slightly nicer "rank" computer in accept-header
Stop logging accept-header string

Useless once stable
More usefull except logging
Huge commit: wsgiref-like. "Progress" dropped.

Can now run as HTTP server. Main functions split again (Init, Fetch). LIM/MAX_STUFF moved to function body (this still has to be improved). "progress" too hard to get to work with wsgiref, dropped. This whole thing should make it easier to maintain code (no more ifs everywhere).
Fix bug in parseOptions with values
Commit "id" in feedify

Has been there for a while, never bothered to commit.