Fix for the DLR Line Status

For some reason the TfL API needs the API call to be cased correctly
i.e. /Line/{lineId}/Status, but this only manifests itself when using
the 'dlr' lineId. Strange. We now send the Pascal-cased version for all
lineIds to get round this problem.
Include the reason for the status below the title

Includes the reason for the first status below the h5
containing the statusSeverityDescription. This is only returned from the
API when the status is not "Good Service"
Fix for the "More at..." link to correct lineId

The sourceUrl link which controls the "More at tfl.gov.uk" href is now
fixed to link to the correct anchor for the line in question. This will
open the further information accordion and zoom the SVG map to the
correct line. (There appears to be an issue with the lineIds being incorrect on the
map  on tfl.gov.uk at the moment?)