tidy metadata and crumbtrail css

- increase contrast between metadata/crumbtrail and description
- makes metadata styles consistant between two tabs
remove topic and document series from metadata

the metadata was just getting too long to be useful
Merge pull request #345 from alphagov/meta-data-tidy

Meta data tidy
deleted search results numbers and changed tab description
changes to test for shouty tabs
Merge pull request #347 from alphagov/remove-tab-numbers

Remove tab numbers
Make tests for top result handle 3 results
Bring the first 3 results to the top
Merge pull request #348 from alphagov/top-3-results

Top 3 results
Merge remote branch 'origin/master' into department_search_filtering

Conflicts:
	test/functional/search_controller_test.rb