@Grab annotation support in Groovy interpreter

[nroslavker-schon]

Please add Grab annotation support in the groovy interpreter which would allow adding maven dependencies inline in groovy scripts. For example:
`@Grab(group='org.codehaus.groovy.modules.http-builder', module='http-builder', version='0.5.2')
import groovyx.net.http.RESTClient

println("About to create RESTClient.");
def service = new RESTClient("http://example.com/")
def response = service.get(path: "/some/resource")
println("Response status: " + response.status)`