More cleaning up.
Codestyle and stuff.
Fixed wrong static_assert message.
Beautifulized the result_of<T> for streaming_tag.
Enable Travis CI notifications for Slack.
Properly name the message queue variable.
Fixed codestyle a bit.
Disable clang on Travis CI.

For some reason, clang builds on Travis CI generate a godzillion of
errors, so better disable it again.
Move out all the threading code into a new class.

Named runnables, threading and I/O reactor maintainance are now a part
of the new io::chamber_t class.
Bump the copyright year.
Comment wording.
Properly call remote Locators.
Stop the sync while the Locator is still active.
Merge branch 'master' of github.com:cocaine/cocaine-core
Codestyle.
Codestyle and fixes.
Drop the useless template magic for void drains.

Instead of using an additional trait to detect void rains, specialize
the io::result_of<Event> metafunction.
Serialization traits codestyle fixes.
RPC codestyle fixes.
Drop useless rvalue references on unique_ptr<T>.