Add support for 'morse import <path>'

This allows to import pre-existing simulations in MORSE
for later run them with 'morse run' (or 'morse edit').

'path' must be a local path.

Partially fix #396
[doc] Added a 'quickstart' tutorial

It illustrates to use of 'morse create' and friends.

Partially fix #396
Implement a template for sensors

Used when calling 'morse add sensor ...'

Partially fix #396
[doc] Document in more places 'morse create|add'

Related to issue #396
Removed non-standard ROS serialization for KUKA joints

Originally introduced in #301. The normal way to add custom
serialization is now with 'add_stream'. Cf
http://www.openrobots.org/morse/doc/latest/user/builder.html#middleware-configuration
[unittest] Add a test for 2 Segway RMP400

Exhibit a wheel parenting bug due to Blender renaming wheels.
Spoted by Caleb Voss.
[doc] Updated RELEASE_NOTES/what's new
[builder] mv properties() -> bpymorse

and add set_viewport(...) and delete(obj) in bpymorse module
[builder] mv set_viewport -> bpymorse
[builder] add helper to convert .blend to pure py

at least logic and empty objects (for now)
[builder] add setup replacing basics.blend (logic part)
[data] add basics without logic
[builder] setup cleanup
[builder] reload morse.core.blenderapi in setup

fix #405
[builder] remove MouseSensor.use_pulse

was not in 2.63
[builder] set render fps to 25 (default:24)
[builder] import at the top
[builder] setup scene