Download Jetty instead of including in Grails TARGZ
Install Jetty 8.0 for Servlet 3.0
add quotes on SERVLET_VERSION for comparison
support quoted prop values
Always install JDK and remove special JAVA_HOME logic
Merge branch 'dev-dyn-jetty' into java7+servlet3
Merge branch 'javahome7' into java7+servlet3
Default system.properties
Merge pull request #29 from heroku/java7+servlet3

Always vendor the JDK
Add grails wrapper support
Merge pull request #30 from jarias/wrapper_support

Add grails wrapper support
update to use webapp runner
grandfather in Jetty runner if it was already there
update release_test to new default procfile
Add tests for webapp runner vendoring
Unify vendored file format for webapp-runner
Support default_process_types for Jetty Runner and Webapp Runner
add test for system.properties jetty runner selection
read system.properties and check for selection of jetty
add Jetty version logic back in