Fix some Namespacing issues
Release v3.2.0
doc/tutorial: Document HttpConnection#setHeader modifier
Fix namespases.
Fix tutorial.
Send with exception code, message and data of exception
Add method for getting exception data
Change mechanism of detecting batch. It make possible to detect batch with one request.
Improve validation of callable method.
Make easily test of requests handler:
- Make dispatch() method take request body instead of reading it from stream.
- Change die() to echo().
Stop processing if batch is handled.
Stop handling request if response is occurred.
Fix PHPDoc