Remove enyo.execUnsafeFunction, instead do runtime check once and short but for common non-IE cases. Idea suggested by Roy Sutton.
Remove msapp checks from enyo.machine.script/sheet because we don't support MSApp's with load-time script loading, only minified versions. Better to error out with a security failure here than to load things in wrong order.

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Turn off jshint evil after used in enyo.js

Enyo-DCO-1.1-Signed-Off-By: Ben Combee (ben.combee@lge.com)
Merge pull request #322 from enyojs/refactor-msapp-check

Remove enyo.execUnsafeFunction, instead do runtime check once and short ...