[CMake] add BUILD_PYTHON_INTERFACE option

remove shell

[CI] add .gitlab-ci.yml & badges, use MathJax, fix project url

ref https://github.com/stack-of-tasks/sot-core/issues/58

porting eigen and sot-v3

Merge from stack-of-tasks/devel to proyan/master

Conflicts:
	src/pg.cpp

TODO : clean the code, work on the robustess + the expression of the force and torques projected on the CoM.

-change walking.py to not use ros modules

Remove the use of jrl-dynamics inside the sot-patterngenerator, include a function to use the dynamicd filter or not,
print the forces in a file

compatible with default cmake on ubuntu12.04

Split walk_romeo.py in two scripts and synchronize cmake module