Don't create compact versions of exhibition images

This is not in use.
Add sizing to slideshow image upload.
Bringing up margin of label is for small view only
Add new artists page.

Still to fix
Javascript for thumbnail rollover
Artist name
Fix artist name label for artists and exhibitions.
'Add me to the mailing list' contact form.
Asssssssssssssssssssets.
Add image to about info snippets.

Still need to expose it in the site.
Remove name from 'add me to mailing list' form.
Display and style about info images.
Add fleuron to artists and exhibitions pages.

This shows there is more below the fold if the 
view port is the size of an artist/exhibition page
and also acts as a separator between artists and 
exhibitions.

FLEURONZ!
Stragglin' assets.
Style sign in page.
Asssssets precompile.
Stragglin' assets.
Spruce up the style for sign in page.
Precompile assets.
Style all devise views.
Configure devise mailer address.
Roles and authorization with CanCan.

Admin and artist roles defined, client role still
to be defined.