Merge pull request #2 from DmytroRets/master

Saga prototype.
Extend test framework API.
Extend test framework API.  Extend sample.
Introduce integration and samples modules.
Rename sample 'sample' to 'simpleshop'.
Create new module for simple cqrs sample.
Introduce simple cqes API: commands and events.
Fix issue with sending command when no command handlers specified.
Migrate simple cqrs sample app.
Minor clean up.
Stabilize tests.
Implement aggregate creation by command.
Fix cqrs simple sample.
Update readme: actualize link and add abstract diagram.