Minimal implementation of activity streams
Add missing import, remove broken imports
Revert "Minimal implementation of activity streams", we have finally to chosen to implement activity streams with rest requests to graasp

This reverts commit f83d2bde5a53a64edfcf70d47cbcb6b96e7cfe95.
Revert "Add missing import, remove broken imports", we have finally chosen to implement activity streams using rest requests to graasp

This reverts commit dd6ab87c67deb591442e101c065cf7d77a97851c.
New handler to manage activity streams. Supports simple GET requests.
Implemetation of activity streams (Basic get requests) in an Opensocial gadget. Display the list of activities of one user.
Improve the gadget, start to implement a form to select specific actions or to limit the number of results.
Small improvements on the gadget
Adapted handler to manage contexts, improved the gadget.
New widget that displays a graph of the number of visits per day of the week for the space or the user it belongs to.
Correct a typo in the visits counter gadget.
Place libraries in the lib folder
New gadget which displays as a graph the number of visits for every user of the context it belongs to.
Improve the quality of the two gadgets (labeling, styling, etc...)
Add a graph of the number of visits versus the hour of the day.
Add the possibility to display not only visits, but every actions on the same graph (dynamically) . Possibility to change the time scale (day, hour) dynamically.
It is now possible to dynamically choose the time window of the statistics.
Safari and IE does not support html5 date fields... The widget now use javascript to render them.
Add the improvements to the second gadget (number of actions per User). Improve style.
Rename gadgets.