Reset favico on unloading. Should resolve bookmark favicon issue.

See https://github.com/ejci/favico.js/issues/23 for detail
Merge pull request #131 from lorenzhs/fixfavico

Reset favico on unloading. Should resolve bookmark favicon issue.
Fix display on mobile -- content was partly hidden under top bar
Merge pull request #132 from lorenzhs/fixmobile

Fix display on mobile