Changed http:// call to https://

Reduces another insecure call that can be https
Merge pull request #383 from davidpiesse/patch-1

Changed http:// call to https://
fix #384, passing tests
Merge branch 'master' of github.com:Esri/esri-leaflet
update doc and download sizes
bumping version  to v1.0.0-rc.3
bumping version  to v1.0.0-rc.3
bump releasable
fix dynamic layer load issues