simple upstart script
Merge pull request #815 from leon/master

deployment doc: Upstart script
* Restore scala compatibility check
** but desactivate it by default
** use config param 'groovy.template.check.scala.comptatibility' to activate it
[#1871] Updated the regular expression to not require "java" prefix and
include letters and a dash to support Heroku Java 8 version string
'openjdk version "1.8.0_20-slim"'. Also prints out the version string if
the specific version cannot be determined to enable debugging.