Add missing span to page template

Fixes #67
Cleaned up comments and indentation
Removed conditional author check

Because a post always has an author. Except when Ghost first runs, and there is the welcome post with no author. But in this case Ghost simply outputs nothing - I haven’t been able to make anything explode.
Adding explicit favicon link
2013 => 2014
Update post.hbs

updated twitter url to use https inline with the other sharing services
Merge pull request #70 from altonius/patch-1

Update post.hbs - make twitter link https
Add support for author.url and author.location output

Closes #72
Better responsive images

Closes #76
Corrected link
Remove specific resolution optimisation
bring up to date with upstream/master and bring to ghost 0.4 standard practice (i.e. asset support, and authoring)