Add support for native fullscreen api in Internet explorer.
Currenly works in IE11 (the latest) using the ms prefix.
Merge branch 'ie-native-fullscreen' of https://github.com/mattfawcett/jPlayer into mattfawcett-issue-213
Built js files and tested. #213
Merge branch 'mattfawcett-issue-213' #213 Add IE native fullscreen.