Import base css and pix into Bootstrap
use less to create button CSS

An example of the power of LESS for this kind of work. Previously
the buttons were pages of output CSS, cut and pasted and tweaked. With
less you can mostly just declare what you want things to look like and
it does the rest.

It's not perfect, the admin buttons need work, but you get the idea.
merge in previous commits
remove some redundant mform styles
more minor core.less tidy-ups
Style tables, and submit buttons
Tweak admin form css
make the cancel button less exciting looking
Merge pull request #30 from ds125v/other_stuff

Other stuff