Enyo-2311: New TabPanels samples

Added TabPanels Samples. Also fixed some bugs with TabPanels. 

This PR depends on PR https://github.com/enyojs/onyx/pull/163

Tested on:
* Debian Linux: Chromium 27 and FF 17
* Windows: IE 10 IE9 IE8
* Mac: safari 6 FF 7

* ENYO-2311: Added doc for addTab and removeTab method (HEAD, origin/ENYO-2311, ENYO-2311)
* ENYO-2311: TabBar: Fix mistake in doc
* ENYO-2311: kill last tab is working
* ENYO-2311: Dynamic sample: add and close tab are working,
* ENYO-2311: Simple TabPanel is working
* ENYO-2311: Panels must be drawn at rendering time to compute tab length
* ENYO-2311: test this.debug before calling log
* ENYO-2311: removed dlog function

Enyo-DCO-1.1-Signed-off-by: Dominique Dumont <dominique.dumont@hp.com>