#94986: Added wicket library and jsts to handle operations on geometry.
#94986: Added luton railway and replaced display of gmaps circles around stations with a geometrical union performed using jsts, which is a bit slow, which would explain why in walkscore a mask is used, probably drawing in canvas....
#94986: added wicket and jsts libreries script tags and reorganized a bit the header.
#94986: added support for ngChange in the slider directive, needed so we can handle the change event of the walking distance time slider.
#94986: changes due to model structure changes.
Minor unrelated changes.
Merge pull request #39 from luisromangz/94986-JSTSUnionOfWalkingDistanceAreas

#94986 jsts union of walking distance areas