Integrate Training Activity with zendesk

Add a libsoup-based implementation of the zendesk
web services API client.

This module allows creating tickets and attachments
from the Training Activity.

It is intended to be used from the Training Activity
Help panel.

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Connect Help panel to Zendesk client

Signed-off-by: Martin Abente Lahaye <tch@sugarlabs.org>
Merge pull request #24 from tchx84/soupdesk

Soupdesk