Python: added example/iterate.py - script for iterating node or nodes in groups
Added example script and c++ code for iterating specified nodes or all nodes in specified groups
Merge pull request #236 from shaitan/master

Iterators examples
Call backend's bulk_read before calling several read handlers
Merge pull request #237 from euroelessar/bulk_read_notsup

Call backend's bulk_read before calling several read handlers
Changed error_t to storage_error_t
Additional comment for iterate_thread_num
Moved elliptics_timer to local_session.h
Added more timers to built-in cache
Added more timer logs to cache
Moved from std::chrono to dnet_time in timer logs
Fixed elliptics_timer sign
Additional fix of signs in elliptics_timer
Added elliptics_unique_lock for more log info
Fixed log verbosity for cache erasing
Fixed syncing of all syncable objects in cache at overflow
Changed atomic from int to long to fix overflow
Return -ENOTSUP if backend don't know the command
Merge pull request #235 from shaitan/python

Fixed python bindings and added storing ids files in elliptics itself.
Merge pull request #238 from euroelessar/master

A lot of changes