bump sbt version to 0.12.1

try to use env vars for the port and public directory

Also use a listener

escape sbt script for stringtemplate

add sbt launcher script

bump to 2.1.1

bump jetty version

Use 2.1 on the master branch

Use 2.1

put it on compile classpath not container

update to latest jetty and resolve orbit stuff

Reset content type to null in notFound handler

Reset content type to null in notFound handler

update to scalatra 2.1-RC3 and latest jetty

update versions for 2.1