Look inside skin.xml for <MinimumSize> to determine if the skin is compatible.

Fall back to the skin filename if regex fails.
More flexible regex just in case.
Reduce minimumsize of LatenightStacked so it works on monitors with exactly 768 vertical res.
Merge pull request #274 from ywwg/skin-size-detect-fix

Look inside skin.xml for <MinimumSize> to determine if the skin is compa...