Python: added set_keepalive method to elliptics.Node. Aded merge_indexes and recover_index to elliptics.Session
Recovery: replaced merging index shards by calling elliptics.Session.merge_indexes.
Docs: fixed typo.
Core: added checking size of object before reading ext header. Made reading ext header in blob_read and blob_file_info in same way.
Merge branch 'master' of github.com:reverbrain/elliptics
Pytests: fixed test_session_indexes - wait set_indexes/remove_indexes results.
Pytests: used .wait() instead of .get() for AsyncResults which results we do not checks.
Merge pull request #485 from shaitan/master

Extended python binding, changed recovery and fixed reading ext header of object.