move leaflet resources to top of lib/
update to proj4js v1.3.4

- dist/proj4.js -> proj4-compressed.js
- dist/amd/proj4.js -> proj4.js
require.js 2.1.8
update proj4 usage
process urns into shorter codes if needed (resolves proj4js/proj4js#49)
umd pattern (based on jqueryPluginCommonjs)
update paths in tests & some examples
update geojson example

 - new proj4 usage
 - AMD/RequireJS loading
update readme
correct proj4js npm name
Merge pull request #41 from sheppard/new-proj4

Updated to new Proj4js (Proj4) for node.js/AMD compatibility.