Data changes

Added dummy population pyramid data for West Midlands;
Altered ONS id codes for areas to match population data codes: St
Albans, Welwyn Hatfield, Northumberland and all the Northern Ireland
regions;
London title changed
Regional Page

Disabled buttons and added id tag to display Region name in main heading
Regional Page

Changed population comparison chart title
Regional Page

Changed data model to use ONS id instead of region name as there was
differences in names used in different data sources;
Regional Page

Clears existing polygons from the map before drawing new ones.;
Removed scroll wheel function from map