Add 'pull-right' class to the users drop down menu

The drop down menu on the user name link in the main menu hangs off the edge of the browser window when open in certain situations.  Add the pull-right class to it to float it under the menu instead
Show something in voting mode if you're not logged in.
This is what happens when you don't TDD.
Merge pull request #32 from fullybaked/reposition_user_dropdown

Add 'pull-right' class to the users drop down menu
Add a holding mode between voting and showing the agenda.

This gives us an opportunity to ensure all selected proposals can be given.
Merge pull request #33 from rubymanor/holding-mode

Add a holding mode between voting and showing the agenda.
Remove extra statement modifier
Add confirmed flag to proposals.
Show the proposer name on a proposal if we are in agenda mode and their proposal has been confirmed.
Add explanatory text about the agenda (how many talks, why some have names).
Merge pull request #34 from rubymanor/show-names-for-confirmed-talks

Show names for confirmed talks
Add padding to the chosen proposals list
Only show the top 8 as there will only be 8 given on the day

Should we need to withdraw a talk because it doesn't get confirmed then we can cope with that later.  Either just pull in 9 or 10 proposals, or we withdraw the non-confirmed talk and have @top_proposals not include it.
Add some margin to the bottom of the agenda.