ENYO-2427: Updated layout.design to better handle LIST in Ares Designer

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
ENYO-2431: Cleanup of "inline" properties in layout.design

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
ENYO-2431: Cleanup of "inline" properties in layout.design

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
ENYO-2427: Updated layout.design: removed useless "isContainer" and "content". Added "isRepeater" options to "list" kinds

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
ENYO-2431: Updated layout.design to remove unused "inline" properties

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
ENYO-2431: Updated layout.design to remove unused "isContainer" properties

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
ENYO-2431: Updated layout.design to fix or remove "content" properties

Enyo-DCO-1.1-Signed-off-by: Yves Del Medico <yves.del-medico@hp.com>
Merge pull request #25 from enyojs/ENYO-2427

ENYO-2431, ENYO-2427: Updated layout.design

Reviewed-By: Ben Combee (ben.combee@lge.com)