Fix proxy message.
Django asynchronous usage introduced.

* django example updated to demonstrate asynchronous usage
Thread-safety guarantee for chain.All class.
Some refactoring over tools.
Some tests added.

* checks currently broken functionality
Doctest warnings fixed.
Cocaine tool app remove prettifying.
Cocaine tool app check information expanded.

* now it checks both availability and status.
Documentation updated.
Do not use version generation based on debian changelog.

When package installs via pip, version of package are always evaluated to 0.10.6.0, because there are no debian changelog in the moment of installation. Or extract version from debian changelog, write it to file and distribute with pypi distribution.
Merge pull request #7 from mou/patch-2

Do not use version generation based on debian changelog.
Elasticsearch service usage example added.
Fixed bug with multiple yielding empty generators.

* more log verbosity
* another pack of tests has been written
Fix failed json constructing when some error occurred while performing cocaine-tool info.
A lot of documentation added.
Tornado version updated in dependencies.
Changelog bump.
Cocaine-tools: call method now can format json output.
Simplify django application configuration.
Style.