[ADD] web, web_kanban: moved sparkline and gauge widgets from crm and sale_crm into web, because other modules will have to use it in kanban veiws.
[FIX] sparkline widget: fixed some default values computation
[MERGE] Sync with trunk
[IMP] [FIX] kanban: updated justgage and sparklin libraries; fixed gauge widget showing 0 as value by forcing a refresh
[MOV] [ADD] Moved gauge and sparkline widgets into their own modules.

Introducing two new web modules: web_kanban_gauge and web_kanban_sparkline.
[CLEAN] qweb, kanban: removed forgotten console.log + unnecessary void line
[MERGE] Sync with trunk
[MERGE] Sync with trunk
[DOC] web_kanban_gauge, web_kanban_sparkline: added doc with changelog
[MERGE] [ADD] Two new web modules: gauge and sparkline kanban widgets.

Those widgets come from widgets previously defined in crm (for gauge) and sale_crm (for sparkline). As other modules will soon use them (mass mailing, gamification, accounting dashboard), they have been moved into their own web modules.