[+] Create the GitSessionKit. It does nothing for the moment.
Load source code from the local git repo seems to work. I need to make some other tests.
Change the way loadLesson works : we no longer need the zip overview.
[+] storeLesson and storeAll are now implemented
[Fix] some wrong path
[-] Debug messages
[+] Clean functions are now implemented
[+] Some comments
Merge branch 'PIDR2014_GitSession' into pidr-2014-push