Expose fine-tuning knobs in Cocaine extensions.

Allow Cocaine extensions users to configure various Elliptics client
settings, such as timeouts and thread counts.
Merge pull request #160 from Kobolog/master

Expose fine-tuning knobs in Cocaine extensions.
Explicitly stop engine upon dnet_app_t destruction
Merge branch 'master' of github.com:reverbrain/elliptics
v2.24.10.4
Removed debug print from IteratorResult.merge
Merge branch 'master' of github.com:reverbrain/elliptics
Merge pull request #161 from shaitan/master

Removed debug code.
Added `remove_on_fail` error handler

which removes data if checker returned `false`
Removed std::cout debug printing
Uses result_error_handler instead of std::function
Temporarily disable module backend build on rhel6
Merge branch 'master' of github.com:reverbrain/elliptics
Added log output + description of error handler
Disable glob matching for module backend in rpms
Merge pull request #162 from iderikon/master

Added `remove_on_fail` error handler
v2.24.10.5