Changing Beta Indicator call to use new BetaLabel

Following on from https://github.com/alphagov/slimmer/pull/65. Only merge
once Slimmer has been updated and the  new version is in the Bundle.
Slimmer version bump with BetaLabelInserter

Now that https://github.com/alphagov/slimmer/pull/65 has been merged,
Contacts can display the BetaLabel properly
Restructure markup to remove empty beta div
Merge pull request #95 from alphagov/beta-label-change

Changing Beta Indicator call to use new BetaLabel
Fixing the development setup to reduce the dependencies on other apps

The main change is that the mock orgs API only contains HMRC
and using the in memory rummager client from whitehall.

* Uses mock APIs for rummager and organisations APIs
* Drops contacts_search_client as we do not search rummager for search
* Change the server to be thin in dev (to align with other apps)
* Remove rack-mini-profiler probably best to use newrelic when needed
Use fake rummager in the test env

Also moved test env configs into the config/environments/test.rb file

Remove a test that isn't used with fake rummager
Merge pull request #105 from alphagov/better-dev-setup

Fixing the development setup to reduce the dependencies on other apps
Merge commit '7b9f627845d57070727b329b8e23a919f11fe1ea' into HEAD