Merge branch 'refs/heads/geocoder-breaking-change' into release-3.0

changed this reference to leaflet be the same as we use in the core t…

…ests and the other example.

Examples: Add new index/landing page

Reworked OpenLayers Polyline.show and Polyline.hide in line with @dez…

…fowler's comments on Issue mapstraction#209

Up the version number to v2.1 (yay!)

Pre-release version 2.0.18

Pre-release version 2.0.17

Pre-release version 2.0.16

Pre-release version 2.0.15

Pre-release version 2.0.14