Fixed a typo in the changelog.
Do not stop the engine if a slave disconnects.

A disconnected slave was previously considered an abnormal app error, so
the engine shuts down if this happens. Now only those errors which are
explicitly marked as abnormal by app itself will do that.
Do not warn about dropping zero sessions.
Merge branch 'master' of github.com:cocaine/cocaine-core
Update README to reflect the actual features.
A simple vector iterator is okay for transforms.
Merge branch 'master' of github.com:cocaine/cocaine-core
Simplified file storage read() method.
Simplified static checks in Repo.
Simplified JSON->MsgPack packing.
More const-ness and proper lock types.

Apply const modifier to more types across the code, as well as change
some unique_lock<T>-s to lock_guard<T>-s where applicable.
Check if stream is empty pointer in decoder

Decoder has default constructor that makes empty m_stream, but ~decoder dereferences it. So ~decoder must first check it!
Use const iterators where applicable.
Merge pull request #38 from andrusha97/master

Checking pointer before dereferencing
Merge branch 'master' of github.com:cocaine/cocaine-core
Code style.
Switch file storage find() logic to intersection.
Revert "A simple vector iterator is okay..."

This reverts commit e3c89a3ad49552dde4387a9f6f4c684a05dc7a97.
Merge branch 'master' of github.com:cocaine/cocaine-core
Merge branch 'master' of github.com:cocaine/cocaine-core