This is a small script I use for building and testing Marvin for Coda 2s
!/bin/sh
cd ${TARGET_BUILD_DIR}
cp -r ${WRAPPER_NAME} "/Users/username/Library/Containers/com.panic.Coda2/Data/Library/Application Support/Coda 2/Plug-ins"
All the script does it to copy the built plugin to your Coda 2 plugin directory.
To test the plugin you need to restart Coda 2.