Repl.html: Don't hard code to use http
Repl.html: Don't hard code to use http

Also use link tag instead of @import to allow parallel downloads of resources.

Review URL: https://api.github.com/repos/google/traceur-compiler/issues/776

Closes #776.

sebmck/traceur-compiler,mathiasbynens/traceur-compiler,bjlxj2008/traceur-compiler,bazaarvoice/traceur-compiler,sebmck/traceur-compiler,sebgod/traceur-compiler,arv/traceur-compiler,renie/traceur-compiler,pandoraui/traceur-compiler,astralfoxy/mirai-traceur,renie/traceur-compiler,johnjbarton/traceur-compiler,longze/traceur-compiler,lintangarief/traceur-compiler,johnjbarton/traceur-compiler,guybedford/traceur-compiler,longze/traceur-compiler,wilsonokibe/traceur-compiler,wilsonokibe/traceur-compiler,bazaarvoice/traceur-compiler,vicb/traceur-compiler,pandoraui/traceur-compiler,kittens/traceur-compiler,sid0818/traceur-compiler,vicb/traceur-compiler,rossberg-chromium/traceur-soundscript,google/traceur-compiler,arv/traceur-compiler,bjlxj2008/traceur-compiler,lintangarief/traceur-compiler,sebgod/traceur-compiler,kittens/traceur-compiler,google/traceur-compiler,rossberg-chromium/traceur-soundscript,sid0818/traceur-compiler