fixed path for env
Merge branch 'develop' into feature_mongokit_ee_integration

transform documentaion form epydoc to sphynx
add graphviz extention in sphinx
add graph of states/transition  between status
remove mock database replace by real mongokit code
change string representation of status
remove status.py and the coresponding unit test from core as is now in mobyle2.lib/job.py module
transform JobsTable to work with the mongokit version of mobyle2.lib/ClJobs instead of JobRef
replace triple quote around header file (licence, ...) by comments

if the header is in """ quote it is interpreted by sphinx automodule
with a ugly style. to be ignore by sphinx replace """ by blocks comments
remove extra lines which should not be on test
remove extra spaces
add module to discover unit test

this module allow to discover unit test and set up the environment to
connect with a mongodb server
add configuration file for mongodb server for the units test
transform DBManager to use mongo

the methods in DBManager use Job in their mongo version instaed of
JObRef and mock for a DB