New version of IPython Xblock

Launch Iframeresizer synchronously
parse all sql table containing data in relation with user
delete dprint and use prettyprinter
add some comment to perform mongo search
New version of IPython Xblock

- stop auto-sizing height
- set correct xblock display name in LMS
#622 change course start date display
#752 missing i18n
perform mongo search and write it in same file
remove comments and add explanation
remove old mongo function in comments
add in help : if not the filename will be export_theusername.log
Better serialization of mongo data + add UserProfile SQL table
#748 add emailing result file
Change i18n: badge when following a forum topic: suivant => suivi