Comment out failing Date tests until further investigation 

IE was failing date parsing tests because `(new Date()).toString()` will return something like `"Sun Oct 27 11:24:18 PDT 2013"` instead of `"Sun Oct 27 2013 11:24:18 PDT-8000"`

This needs to be investigated more and possibly have the date normalized before parsing and formatting. 

Ping @lsmith @rgrove @ericf