[mongodb_openni_compression] Add logging to mongodb

This:

* Adds an action server `/record_camera` that enables temporary logging to the mongodb database.
* Launch everything by `roslaunch mongodb_openni_compression record_server.launch`
* Saves rgb image in `/rgb_compressed`, depth in `/depth_compressed`

Will add a replay launch file as soon as https://github.com/strands-project/mongodb_store/issues/116 is fixed.
Will also look at handling shutdown of `roslaunch_axserver` and feedback from it. However, this is a starting point that should work and has the general structure.
@marc-hanheide I tried to find some actionlib tutorial, easy enough for SimpleActionClient but I didn't really figure out the ActionClient. Do you know what I have to do to republish the feedback from your actionserver and quit mine if yours return failure?