Dropped a self-explanatory comment.
Fix selecting of a service from a routing group.

Locator must not inspect groups for which sum of weights equals zero (not "doesn't equal"), because such groups don't have an active services.
Add libcgroup to build dependencies in *.spec.
An ability to pick the Logging Service backend.

Conflicts:
	include/cocaine/api/logger.hpp
	include/cocaine/detail/services/logging.hpp
	src/services/logging.cpp
Releasing v0.11.2.0.
Isolate logger now has own prefix.
Bah, isolate system has very small amount of logs, so let it push them with the `app` prefix.
Merge pull request #68 from 3Hren/v0.11

Isolate logger now has own prefix.
Changelog bump.
Added support for Fedora 19, 20
Merge pull request #69 from ApelSYN/v0.11

Added support for Fedora 19, 20
Fixed race in engine.

An application runs own engine in new thread in 'start()' method and the engine changes self state to running in that new thread. All requests to the application, which are received after the application is started and before the engine state is changed, will fail. This commit fixes the bug. Now engine sets self state to running in constructor, right in app_t::start() method. So an application can process requests right after it is started.