Redesign of contact show page and related changes

Contact show page redesign from @AmyWhitney, which is attached to PR. This included removal of Transaction Link, Quick Link Description and change of beta header to be a beta notice style label like https://www.gov.uk/oil-and-gas. Beta notice needs https://github.com/alphagov/slimmer/pull/64 and https://github.com/alphagov/static/pull/381 in order to work.

![contact_show](https://f.cloud.github.com/assets/449004/2376070/564b79bc-a872-11e3-9cfe-34bf34744a55.png)