Merge pull request #112 from fatalbanana/master

Remove CBL as it's wholly included in Spamhaus XBL
Update readme.
Rework API completely.
Start new upstreams implementation.
Split addr definition from the utils code.
Rework host/port/priority parsing.
Add some basic logic for upstreams.
Allow multiple addresses per upstream.
Upstreams get implementation.
Fix lua upstream code.
Merge branch 'upstream-rework'
Disable binlog configuration as it is anyway broken.
Fix some more old upstreams code.
Allow addresses to be allocated in rspamd_mempool.
Rework and simplify listen sockets creation.
Add parsing of multiple upstreams string.
Fix smtp proxy code.
Fix surbl.
Some more auxiliary functions.
Fix fuzzy_check.