GitLab

* add GN support for flops computation

* remove useless lines

* modify the flops computation for gn

* add testing in Travis

* add proj. requirements

* install CUDA

* def tested packages

* add missing meta in setup

* add empty test

* restructure travis tests

* add sample doctest

* switch to nose2

* add sample test

* using pytest

* minor fixes

* add flops counter

* minor fix

* add forward_dummy() for most detectors

* add documentation for some tools