[FIX] website_instantclick: this lib create some bug because the odoo assets are loaded in the body and some event are binded more of one time. Change the js lib  because the xml can't be change in 8.0. TODO: move assets into the head and fix js files and remove this commit in master
[IMP] module/loading: do not try to load module graph when nothing to load

This simple optimization in load_marked_modules() avoids unnecessary calls to
load_module_graph().  This provides a small speedup, and avoids confusing log:
some module updates were making it look like the registry was loaded 5 times
instead of once.
Merge branch '8.0' of https://github.com/odoo/odoo into 8.0-win32