[NEW] First stab at v1.3.
[NEW] Set up sharing menu.
Merge branch '1.2'
[FIX] Fixed Bootstrap CSS, Font Awesome reference.
[CHG] Adjusted size of file icons.
[CHG] Media query for max-width 320px.
[NEW] Added 'powered by' notice on hover on #sharing.
[NEW] Added 'powered by' notice on hover on #sharing.
[NEW] Added 'powered by' notice on hover on #sharing.
[NEW] Added transition on vertical move / resize.