update leaflet version and update the example page to use node module js files.

[rrameshkumar76]

Updates leaflet version and update the example page to use node module js files to avoid copying them in web examples.

[gordonwoodhull]

Thanks for working on this, @rrameshkumar76!

Updating the example page isn't necessary, because the way the project works is that grunt copies stuff from node_modules into the web directory, which is what we publish.

I've updated a few other dependencies and published this as 0.3.1

[rrameshkumar76]

Thanks a lot Gordon for this upgrade.