Additions to HTML standard

* More general rules
* Dropped "support" for <IE7
* Added lang tag to prevent having to add it for html5 validity
* Added utf-8 rule
* Added some information about semantics
I remember listening to some google dudes talking about it and it's also explicitly mentioned in h5bp: https://github.com/h5bp/html5-boilerplate/blob/master/src/doc/html.md#the-order-of-the-title-and-meta-tags