Merge pull request #35 from euroelessar/master

Added file_info reply to cache-only write requests
IO flags comment update
elliptics-dev should depend on eblob - there is no eblob-dev package
Depend on 0.10.0-rc2+ cocaine
v2.21.4.1
Added zmq deps - missed in cocaine. This is temporal step, zmq will be dead in 0.10
Depend on 0.10.0-rc3+ cocaine
v2.21.4.2
Merge pull request #36 from euroelessar/master

Fixed write_metadata/create_metadata methods
Added leveldb metadata write() error description
Python test files update
Use poll() in autodiscovery. Socket must be bound to recv data.
v2.21.4.3
Merge branch 'master' of github.com:reverbrain/elliptics
Use bp=boost::python namespace
Fixed route table python viewer
Send discovery at startup
Added support for several io threads for client
Fixed bulk_read
Added convience methods for data_pointer