[BUGFIX] header.types adjusted to W3C Spec

According to W3C, only 1-6 are valid levels

Trying to understand FCC now and use it in newer Projects.
By this http://www.w3.org/wiki/HTML/Elements/h1,_h2,_h3,_h4,_h5,_and_h6
there should be only Header Type 1-6