First step for keyboard navigation in Tuleap

Available shortcuts:

Sidebar (project)
-----------------

s : Open/Collapse the sidebar
p then h : Dashboard of the project
p then a : Agile Dashboard
p then p : Project web site
p then d : Documents
p then m : Mediawiki
p then w : Wiki
p then t : Tracker
p then g : Git
p then s : SVN
p then c : CVS
p then f : Files
p then b : Forums
p then n : News
p then l : Lists
p then i : Instant messaging

Navebar
-------

g then h : Homepage
g then m : My personnal page
g then p : Open "Projects" dropdown
g then a : Open the account management dropdown (need to be connected)

And more...
-----------

Esc : Escape from input/textarea, close dropdown or modal
? : Open/Close the shortcut window

Change-Id: I99e17fb9dc4f4e249c431445376d290abae788fc
Merge commit 'refs/changes/52/2752/16' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  First step for keyboard navigation in Tuleap

Change-Id: Ic24bdfb153b2f67246eb753a56210d753c2a2bf8
Tuleap 7.3.99.44

Change-Id: I08206b4d1c42b1def14c5e399a038355fe64acc8