Release v1.8.0

ChangeLog:

[example] Updated jupyter notebook
Fixed issue in the plotSolution function for biped robots
Fix typo in README
Run unittests in ROS-CI, deactivate Travis-CI
Align the arguments in python
[cmake] use OPTION to set BUILD_TESTING
Introduced pair collision cost
fix include sequence after pinocchio commit c1ff8821c437e2401b80b7aa7f3f118464e2c051
Introduced the printing functions for action, cost, activation, residual, contact, and impulse models
Only build Python-examples if bindings are built
RK4 unittests
Enable to derive quasiStatic in Python #825
[C++14] Move default C++ standard support to 14
Deprecated BUILD_UNIT_TEST + removed legacy files + updated README file (with pip installation)
Fixed GV display after changes in #911
Created residual models to be shared between cost and constraint models