Merge pull request #11 from Livefyre/composite-view

Composite view
Fix bug with destroy
Call base render/destroy in respective methods in compostie view
Add tests for #render and #destroy of composite-view
Update interface of CompositeView (#add/#remove) to be consistent with a ListView
Enforce node >=0.10.0 dep as other dependencies imply this.
Add render opt to add CompositeView#add method. Subviews added in constructor are not rendered immediately.