changed logo

Conflicts:

    assets/images/logo.png
Use white icon for search.
Add custom footer

Does not include logo.
Add custom credits template.
Override locale_switcher to add mySociety header.
Basic styles for WDTK
Add transparent background to icons
Add icon for high pixel density devices
Set heading colour.
Set status colours (icons pending)
Use typekit font.

Just apply font to entirebody - don't want the admin bar (when visible) to be styled with this font. Adjust button padding for new font.
Set font for incoming correspondence
Add styles for notices and error messages.
Style the dts on the help page to be bigger on larger screens
Override the help layout

We don't use the grid here, unlike base Alaveteli, so don't need to
mixin grid row.
Style popups as notices
Style links in correspondence and link box
Style describe state form
Fixes for older versions of IE

Reposition mysociety image for older IE - older IE has no support for background-size

Remove button padding in IE 7 only, position search icon, add color fallback.
Styling for attachment header.