Add logging of rendering time per sample when in extras test mode

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Update sampler to include layout/flex samples and assets

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #34 from enyojs/add-layout-flex

Update sampler to include layout/flex samples and assets