move the banner to the top of the layout so it can show on all pages
render the banner as a notifications bar
add a dismiss button
slide out quicker
add the jquery cookie plugin
fix a bug in the voting dates
allow the dismissed banner to come back when the event changes
add a link to the create session page from the sessions page

This is needed in case the user has dismissed the notifications bar.
Fixes #35
split onto separate lines
add an href to the a tags
darken the border of the close button slightly and remove the greenyellow hover colour
revert a change to stop a migration from happening
use the helper to output the event name
change the comment style
inline some variables and rename the data attribute
replace the X with a proper cross
reduce nesting by inverting an if
Merge branch 'shouty-box' of https://github.com/adrianbanks/dddeastanglia into adrianbanks-shouty-box
Fix stray JavaScript code.

A stray closing "});" made its way into the HTML, so remove it.