Daniel Bevenius 43bfc244cf Changed Http2ClientConnectionHandler to print out the aggregated buffers content
Motivation:
When running the Http2Client the data returned from the server, the
"Hello World" string, is supposed to be printed but instead the following
is displayed:
Received message:

Modifications:
Use the aggregated buffer to print out.

Result:
The example now logs the correct data sent from the server:
Received message: Hello World
2014-07-03 07:06:19 +02:00
..
2013-01-07 21:06:22 +01:00