Introduce experimental theme with new navigation

Import theme from dev/322_ux_enhancements

Change-Id: I7fcea5a15fa845cac8516bc0aa553ca056b1d3cc
The experimental theme is in lab mode

Change-Id: If8e4c713c915c2c8107eb7f6f3b53566664d2433
Introduce experimental theme with new navigation

Import theme from dev/322_ux_enhancements

Change-Id: I7fcea5a15fa845cac8516bc0aa553ca056b1d3cc
Merge commit 'refs/changes/82/582/3' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  Introduce experimental theme with new navigation

Change-Id: I3639dd9a1e60012ade3d07c28f492ecb3d45b706
Merge commit 'refs/changes/83/583/2' of ssh://gerrit.tuleap.net:29418/tuleap into tuleap-stable-master

* ssh://gerrit.tuleap.net:29418/tuleap:
  The experimental theme is in lab mode
  Introduce experimental theme with new navigation

Conflicts:
	src/www/themes/Experimental/Experimental_Theme.class.php

Change-Id: I9075364e7c6b03f58bdcabe274def258af1fd220
Tuleap 6.2.99.9

Change-Id: I86e0b27cd40a3b909e9eea79cb1699d01e1e2aa8