[builder] edit module data docstring

previous was not well handle by sphinx
[builder] random docstring cleaning
[doc] installation ROS Groovy instructions
[ros] merge doc in docstring
[pocolibs] Improve viam output so it can work for VideoCamera too
[pocolibs] Add some way to export depth image thought Spix3DImage
[doc] add ROS Troubleshooting, fixes #225
[yarp] Provide encoding for some commonly used structure

Include encoding for:
  - mathutils.Vector -> list as sub-bottle
  - mathutils.Matrix -> list of list
  - mathutils.Quaternion -> list (x, y, z, w)
  - mathutils.Euler -> list (yaw, pitch, roll)
  - transformation3D -> list (x, y, z, yaw, pitch, roll)

Fix issue #259
[doc] use openrobots git to be consistent

with both dev/summary and contributing (same §)
[ros] fix typo in GPS publisher

Thanks to Serge Stinckwich for reporting this issue
Fix documentation for ROS msg type for GPS
[builder] add MotionVWDiff ROS support
[odometry] move v and w to integrated level

ROS Odometry always needs to explicitly write::

    odometry.level('integrated')
[ros] docstring: on the way to generate doc :+1:
[odometry] set integrated level as default
Add new tutorial on quadrotors.

Inspired by the cat and mouse game.
Use the waypoint actuator for the quadrotor.
Merge branch 'master' of ssh://trac.laas.fr/git/robots/morse
[ros] docstring use ros_class variable

Used to create the topic and to generate doc.
While here, add a default_frame_id for some components, the one without
will keep the morse convention, which is the same than the topic name
("/robot/sensor"). Which can also be overriden by an kwargs of name
"frame_id".
[ros] pseudo-wrap mathutils for docgen
[doc] add tool to generate datastream doc