Merge pull request #251 from nikolaswise/beta5

microsite homepage
cleanup gruntfile and rebuild
Beta 5
merge beta 5 work with docs site
Merge pull request #252 from patrickarlt/beta5

Beta5
git works
Merge branch 'beta5' of github.com:Esri/esri-leaflet into beta5
rebuild to include basemap layer
Merge branch 'beta5' of github.com:Esri/esri-leaflet into beta5
Merge branch 'beta5' of github.com:Esri/esri-leaflet into beta5
homepage map