Merge pull request #5 from bchretien/master

Fix cubic B-splines
Update to new roboptim-core API.
Update Travis to support coveralls.io and automatic documentation update.
Add CONTRIBUTING.md file.
[travis] Lookup for plug-ins in architecture independent library directory.
[travis] Install liblapack explicitly.
[travis] Add coverage flags.
[coveralls] Fix badge in README.md
Add vector-interpolation (migrated from roboptim-core)
Remove ublas includes and using namespace.
Add CONTRIBUTING.md [skip ci]
Fix nonscalar vector interpolation
Debug vector-interpolation class
vector-interpolation: debug implementation
Debug vector interpolation
Add non-scalar constraints support in StateFunction::addToProblem

Close #6
vector-interpolation: add missing include to boost/make_shared.hpp
[travis] Use jrl-travis
[jrl-cmakemodules] Synchronize
[travis] Synchronize