ENYO-3944: Add Sampler support for IE8

Moonstone is loaded into the Sampler, which has support for IE8. This requires Moonstone to be a little more supportive.
This is PR 2 for JIRA: ENYO-3944.
Related PR: https://github.com/enyojs/enyo-ilib/pull/60
Enyo-DCO-1.1-Signed-off-by: Jeremy Thomas <jeremy.thomas@lge.com>