Fix warnings.
From : http://www.w3schools.com/tags/tag_link.asp
Note:  This element (link tag) goes only in the head section, but it can appear any
number of times.
Also changed ampersands to equivalent character entity references.
Fix warnings and errors.
Mostly minor fixes around variable usage and semicolons;
Changed the usage of the (now deprecated) "default" parameter setting.
Merge pull request #11 from derrickoswald/master

Minor index.html mods to remove warning messages.