Release 0.8.2

Release 0.8.2

* Create fuzzy db if it does not exist
* Fix: Centos init script: configtest() (by @AlexeySa)
* Enable one_shot for RECEIVED_SPAMHAUS_XBL - Fixes #102 (by @fatalbanana)
* Update Exim patch (by @fatalbanana)
* Fix processing of unix sockets.
* Allow applying settings to authenticated users (by @fatalbanana)
* Make settings priorities work as documented (by @fatalbanana)
* Fix race condition in symbols planner
* Add DNSWL_BLOCKED symbol (by @fatalbanana)
* Make Exim pass usernames to rspamd (by @fatalbanana)
* Update RBL module (by @fatalbanana):
	- fix indentation;
	- collapse loops;
	- avoid calling for un-needed information;
	- allow disabling RBLs for authenticated users
* once_received.lua: Fix indentation & add exclusion for authenticated users (by @fatalbanana)
* hfilter.lua: Add exclusion for authenticated users (by @AlexeySa)
* Updates to hfilter rules (by @AlexeySa)
* Set empty <> user or addr for msgs without FROM (by @eneq123)
* Fix: attempt to index field '?' (a nil value) (by @eneq123)
* Fix: if not exist Date-header (by @AlexeySa)
* Add task:get_content() method.
* rbl.lua: Ignore private IP space (by @fatalbanana)
* Allow to check radix maps from lua by rspamd{ip}
* Make local exclusions configurable per-RBL (by @fatalbanana)
* Add rspamd_config:radix_from_config() (by @fatalbanana)
* Support emails dnsbl in rbl (by @fatalbanana)
* Complete rework of url extraction logic
* Allow customizations for unix sockets. (fixes #182)
* Set lua path according to rspamd settings.
* Import lua-functional for plugins stuff.
* Completely rewrite multimap plugin in functional style.
* Fix FORGED_MUA_THUNDERBIRD_MSGID (fixes #186)
* Check IPv6 addresses at dnswl.org and Spamhaus whitelist (by @fatalbanana)
* Add lowercase utility for utf8 strings.
* Various fixes to build system
* Updated debian configuration infrastructure (by @dottedmag)

Signed-off-by: Vsevolod Stakhov <vsevolod@highsecure.ru>