(Bug 5206) Fix styling of 'mod hat' in comments across layouts

-Added the admin notice span inside the .poster span, as they
logically are grouped together
-Gave the admin notice span a class so it can be styled seperately
-Made CSS tweaks to Drifting and Blanket to make styling visually
functional on those two layouts.
(Bug 5206) Move space from end of poster to beginning of admin-span
(Bug 5206) Put space where it really belongs
(Bug 5206) Put space where it really really belongs
Merge pull request #544 from momijizukamori/Bug5206/ModHatStyling

Bug5206/mod hat styling