* Add simple test case for shared memory allocation

* Add two behaviour types of memory allocator: greedy and ungreedy
* Adopt surbl module for new configure style

  convinient way to free objects in pool that was allocated by other
  memory allocation mechanics (e.g. GObject).
  Destructors must be added in pool manually by calling memory_pool_add_destructor
  function.

* Improve configure system by implementing dependencies
* Add .depend files for subdirs that requre it
* Write simple test for expressions parser

* Fix test suite build under linux

  this allows accessing to modules config from perl modules

  without calling of ~1000 free syscalls
* Add memory_pool_alloc0 for initializing newly allocated space in pool with zeroes

* Add some documentation to rspamd (about new filters logic and about protocol)

 - fix cases when new chunk is allocated
 - add memory pool allocator statistics
 - let it work in multi-threaded environment
 - add strdup function for convinience
* Use memory pool allocator more widely to avoid memory leaks in future and optimize performance
* Task pool chunk size is now pre-defined constant (16 Kb currently)

* Add test case for memory pools

* Make AV reference mortal as it is described in perlxs (3)

 - simplify protocol parsing logic
 - add compatibility with sa-spamd
 - TODO: add protocol output for all commands

 - memory pools would be used in modules for allocating task specific data without freeing it separately
 - memory pools growth is implemented as multiplying by 2 its length (for avoiding multiply reallocs)
 - when memory pool is freed all data that was allocated from this pool is freed too

* Fix memcached async library to pass test :)

* Rework build system

* Add some more tests to url testcase

TODO: fix html parsing regexp (now it doesn't work)

* Add whitelist and hosters list to params

* Perl should use separate memcached context for its operations (just do memcpy with the same socket)
TODO: add block mechanics here to avoid memcached connection closing before perl operation is finished
* Change logic of perl chain filter

* Add memcached access api for perl
* Reorganize Makefile, add .PHONY targets
* Fix memcached module as now we cannot write or read several keys in async mode

* Add simple test for new memcached library
* Use glib variants of malloc and free functions in rspamd

* Link with PCRE

* Add perl detection and perl linker's and cflags
* Modify configure to work with BSD sed (stupid and ugly)

* Add some protocol parser with evbuffer
* Add pkg-check to configure script for detecting gmime and glib