use rake that still support Ruby 1.8
back to using Java-style servlet method names - to be uniform across jruby-rack
expanding and real paths (esp. with FS layout) should handle nils
allow to mangle ENV['GEM_PATH'] like we did before using jruby.rack.gem_path = 'env'
update rails versions and rake + setup testing against rails master
setup testing with JDK 8