OO-1589: add the download button to the members table, add setting to disable a column in the exported excel

OO-1583: if a step is disable, check that the task is not in this status and if it's the case, push the task to the next step

OO-1575: fix wrong for attribute some disabled element, for date chooser, render hour and minute for disabled date chooser element, escape blank in Confluence URL...

OO-991 i18n, xss, fix filename in download, add mail form for coach, improved status feedback, allow submission without documents, add missing identity to created files

OO-1443: upgrade selenium to version 2.46 which is much quicker as 2.45 and fix an issue with Firefox 38, fix a race condition in the business gorup tree which make the links unusable, fix a upper/lower case issue if the selenium tests are run with PostgreSQL