Cache: Copyright added, time_stats added
Merge branch 'master' of https://github.com/reverbrain/elliptics into io_stats
Cache: time_stats, json, erase_strategy

- time_stats tree refactored
- cache stats conversion to json added
- cache overflow erase strategy changed to avoid writes or reads on
  keys to be synced.
doc: Added documentation generation by doxygen

It can be run by 'make doc', result is put into ${build}/doc directory
Merge pull request #328 from euroelessar/master

doc: Added documentation generation by doxygen
rpm: added make test
Merge pull request #329 from euroelessar/master

rpm: added make test
Monitor: Added REST-like api for getting monitor statistics.
Python: fixed None usage as Id in session.exec_()

Check must directly compare PyObject* to Py_None singleton, because other method
(checking object equality to python::api::object()) involves user defined
comparing/equality operators.
This is the case with elliptics.Id which has __cmp__ method, which
cannot accept None as an argument.
Merge pull request #332 from shaitan/monitor

Monitor: Added REST-like api for getting monitor statistics.
Merge pull request #334 from ijon/fix-python-none-as-exec-id

Python: fixed None usage as Id in session.exec_()
Python: fixed writting out of memory.
Merge pull request #335 from shaitan/monitor

Python: fixed writting out of memory.
trans: randomize route table update: select 5 random groups and read table from one random node from each selected group
monitor: fixed monitor header ifdef decoration
Python: dnet_balancer and fixes
route.py: fixed pep8 warnings, restored neighboring routes which belongs to one node
__init__.py: provided access to elliptics.Route, elliptics.RouteList classes which used by dnet_balancer
dnet_balancer: added script which rebalances ranges in route list.
Balancer: added ability to current route list state without balancing. Moved printing map ids_filename -> node to the end of balancing.
Merge branch 'master' of github.com:reverbrain/elliptics into balancer
Balancer: extended debug logs.
Python: added keeping node inside python elliptics.Session to insure that session will be deleted after node.