Fix bug in resin installation script

This was causing a number of problems!
$ find . -name install.sh -exec grep resin {} \; -exec echo {} \;
fw_depends resin
./scalatra/install.sh
fw_depends java resin maven
./spark/install.sh
fw_depends java resin maven
./gemini/install.sh
fw_depends java resin maven
./tapestry/install.sh
fw_depends java resin maven
./servlet3-cass/install.sh
fw_depends resin java
./compojure/install.sh
fw_depends resin
./luminus/install.sh
fw_depends java resin maven
./ninja-resin/install.sh
fw_depends grails resin
./grails/install.sh
fw_depends java resin maven
./wicket/install.sh
fw_depends java resin maven
./servlet/install.sh
fw_depends java resin maven
./activeweb/install.sh