TranslateComposer can be disabled

When the TranslateComposer is disabled, it no longer claims pointers, prevents default, etc. This is useful if it is attached to a Scroller component which may, dynamically, not need to scroll. Disabling the TranslateComposer enables touches, mousewheels, etc. to bubble up and be handled on a parent component or the default browser behavior. 

This is used in the matte pull request to disable TranslateComposer when the scroller doesn't need to scroll: https://github.com/montagejs/matte/pull/23