add link to readthedoc
change style
Merge branch 'master' of https://github.com/mobyle2/mobyle2.exec_engine
Merge branch 'develop'
Update .travis.yml

add installation of mobyle.conf
remov conf from packages in setup()

as all configuration has been moved in mobyle.conf project
remove installation of mobyle.conf as it's not a dependancies for
unittests
 add figure of mobyle_exec_engine architecture  needed by sphinx
 documentation of the project