Groovy script execution now functional

Example queries:

http://localhost:8888/finch-web-servlet/hello
http://localhost:8888/finch-web-servlet/hello?revision=1
http://localhost:8888/finch-web-servlet/hello?revision=2
http://localhost:8888/finch-web-servlet/hello/bob
http://localhost:8888/finch-web-servlet/hello/Tom