Only set timestamp if it is zeroed
Added set-timestamp() session method
Merge branch 'master' of github.com:reverbrain/elliptics

Conflicts:
	include/elliptics/session.hpp
Fixed response() assignment and warnings
Added indexes profile and manifest
Updated config.json
Merge branch 'master' of github.com:reverbrain/elliptics
Depend on 0.10.4+ cocaine
Depend on 0.10.4~pre0 cocaine