Cache: time statistics added
Cache: fixed constructor for gcc4.4
Cache: typo fixed
Elliptics timer upgraded
Cache: fixed append cache size recalc
Cache: Bug fixes, tests added

Bug with page size recalc fixed.
Test for checking overflow behaviour added.
Function to clear cache added.
Cache: pages space reservation added
Cache: Stats per cache added
Cache: treap merge and insert optimized
Cache: treap priority comparator changed
cache: Improved hash function in cache

Use last 8 bytes in addition to first one. Otherwise all keys for
specific shard comes to single cache object.
cache: Changed format of cache logs

Write log once per action

Conflicts:
	cache/slru_cache.cpp
cache: Added more logs to resize operations

Conflicts:
	cache/slru_cache.cpp
Merge pull request #303 from euroelessar/master

Cache improvements
Cache: stats added, life_check strategy changed

Additional cache time stats added.
life_check now holds lock for all events.
Cache: life_check sync strategy changed
Cache: code style in treap fixed
Merge branch 'master' of https://github.com/reverbrain/elliptics into cache_treap

Conflicts:
	cache/slru_cache.cpp

Cache: stats merged
Python: Fixed accepting IoAttr instead of Id in read/write operations. Fixed overriding write_data by write_data_by_chunks.
Merge pull request #304 from shaitan/master

Python: Fixed accepting IoAttr instead of Id in read/write operations. Fixed overriding write_data by write_data_by_chunks.