* One Definition Rule was still not enforced.
  * Declare function in header sample-model.hpp, implement them in
    sample-models.cpp
  * Add sample-models symbols to libpinocchio.

create model using python & (fix) exposure of joints

[Python][Major] Binding Model::addBody. Be careful, unless C++ method addBody, in python there is no default parameters

[Major][C++][Python]Breaking retrocompatibilty. Added the possibility to choose root joint when creating a model (in C++) or a robot (in Python). May be a check can be done on the value of root parameter in python if it's not None

[CMake][Bug] Fix use of lua sources cmake variable.

Force Pinocchio shared library + move gravity vector to the shared library

[cmake][C++][bug fix] Moved initialization of static const variable gravity 981 from model.hpp to model.cpp. libpinocchio.so is no more empty. Caution : Pinocchio is more a header-only library. One should alwais link against shared library

[travis] Give travis more time for executing full build

Enforce (again) One Definition Rule

Add Wandercraft copyright where needed.

[C++][Bug] Avoid confusion between joint and body methods in se3::Model.

Try to avoid travis killed builds (i.e crashes due to building environment running out of ram)

[travis] Build_type is now MinSizeRel to optimize the comsumption of RAM during process in order to avoid crashes during travis builds. Display memory during build to track RAM information. Reduce number of dependencies

Topic/binding joints

  * se3::Model::getBodyId was used to retrieve joint id in parsers.
  * Implement new methods to retrieve joint ids.
  * Fix body methods.

[C++][Bug] Enforce One Definition Rule in template instantiations.

  * Add inline specifier where needed.
  * This is done to avoid multiple definition when using the pinocchio
    library as a dependency.

[travis] Reorganized travis build to perform 4 tests : gcc Debug and Release , clang Debug and Release. For now, only one test is done to ensure that builds that failed were due to travis build environment running out of RAM

[Python] Binding the different joint models. The exposure is done through the variant. In joints-models, you can specialise the binding for any jointModel you want.

[C++][Bug fixed] Changed from assignation to initialization...

[hotfix] Changed from assignation to initialization for a matrix in symmetric3 that causes computations errors with ubuntu 14.04 in release mode.

Topic/joint dense

[C++]{Minor] Changed the name of the method to access the segment of a given vector. The length of the returned segment depends on the dof of the joint(size NQ or NV)

[C++][Major] Reorganized the methods to acces segments of fixed size (one for NQ, one for NV) from joints indexes

[C++][Major] Added JointModelDense and JointDataDense. Both templated by the dimension of configuration space and tangential space. Each joint can be converted to a Dense one

[Fix Bug] Check norm of the vector to exponentiate

topic/crtp - Convert all current structures to the CRTP template