Modernizr Update, Custom Comments, Direct JQuery Link, Moved Respond Form

Some pretty modest updates but I love the blank theme you made and these few things were bugging me:

1. Removed Modernizr 1.7 and replaced it with version 2.5.3. 
2. Added custom comment layout to the functions.php. 
3. Updated the direct link to JQuery on GCode pointed at the latest 1.7 release. 
4. Moved the respond form to the inc folder to keep the loop clean