Added z-index to map element and demo controls

Seeing if z-index fixes demo controls not showing up in IE 9
Merge pull request #236 from mattsayler/master

Added z-index to map element and demo controls
updated corrected links to leaflet project.
Merge pull request #242 from stanzheng/patch-1

updated corrected links to leaflet project.
rebuild for beta5
cleanup
add projects to readme
update from master
Merge pull request #261 from patrickarlt/beta5

Final updates for beta 5 release