Move the python examples to a subdirectory.

The objective is making room for examples in other languages.
Flush stdout when writing events at the default client main code.

When the body did not end with an end of line, its last line was not shown.
Add an example of a publisher in Java.
Remove old code from the client module.
Improved media-type support.

Events are now represented as application/ztreamy-event.
Update version number and changelog.
Add a MANIFEST.in file for including the examples in the distribution.
Merge branch 'release-0.2' into development.