Added Notification to Chromeframe

Added a <span> inside the Chromeframe to notify users that they can click the frame to hide it.
Fixed click function on Chromeframe

The click function was still targeting the old class of .chromeframe.  Updated to .browsehappy.
Updated styling for Chromeframe

-Moved padding off of the paragraph element and on to the actual div.

-Added span tag in with paragraph to center the new notification message.

-Commented out 2 lines but left them in for you to decide what to do with them.  The Chromeframe is targeting IE8 which doesn't support box shadow so I didn't see a reason for it to be there.  Also the white text shadow when the background color is also white.
Added font size for .browsehappy <span>, fixed <strong> & <b> styling

-Made font size of the <span> in .browsehappy slightly smaller than the paragraph.
-Removed 'strong' and 'b' from line 74 so they would bold properly instead of inheriting the font weight from header_weight.
Merge pull request #86 from noremac13/master

Various fixes to Chromeframe and a fix to bolded elements