Merge pull request #105 from shaitan/master

Multi-range iterators
v2.24.6.1
Updated to the latest upstream cocaine version.
Do not track cocaine/plugins/elliptics-extensions.cocaine-plugin
v2.24.6.2
Removed dependency on cocaine-framework-native
Merge pull request #106 from euroelessar/master

Removed dependency on cocaine-framework-native
Write correctly nulled error string in c++ binding if cmd failed
Do not add \n at the end of server-side messages, they should have them anyway
Use src_key as index within array or started (via start-multiple-task) named workers
Save sph->src_key and use it when calculating named worker index, since it will be overwritten for blocked events
Get rid of old/unused exec/push - locked/unlocked, use plain exec/push and lock flag from session.cflags
Added new exec() method which assigns sph->src_key from its parameter
Use round-robin sph->src_key assignment. Added \n back into srw_log class to workaround cocaine messages, which do not contain it.
v2.24.7.0