Tweaked visual design of Alpha header to use ONS pallete and Golden Ratio sizing.
Merge branch 'alpha-header-2.0'
snagging updates on t3 and search results
Merge branch 'master' of github.com:ONSdigital/tredegar
Made the alpha warning banner into a link.
Merge branch 'master' of github.com:ONSdigital/tredegar
Merge branch 'master' of github.com:ONSdigital/tredegar into spark-line
tidy up unused code, further js unit tests