Merge pull request #7 from jgravois/no-dist

remove built files and add readme
Merge pull request #10 from Esri/gh-pages

add live sample to readme
point CDN links to esri-leaflet 1.0.0-rc.4
Merge pull request #12 from Esri/cdn-links

Point CDN links to esri-leaflet 1.0.0-rc.4