Change jqc.Mask's `isShown()` method to `isVisible()`, and fix issue where if the $contentEl was not visible, it would still be continually positioned as if it was visible.
Merge branch 'master' of https://github.com/gregjacobs/jQuery-Component

Conflicts:
	dist/js/jqc-all-min.js
Rebuild dist files.
Change ComponentQuery to not throw an error when querying for an unknown type name. An empty set is returned instead.
Add fix to subtract one pixel from the flexed size of HBox layout components in order to work around the sub-pixel float wrapping issue.