Implemented groovy support for scripting

Grinder's recent addition of clojure made it very easy to implement support
for Groovy.

I have a branch that I put on my github account with the groovy support, a
basic "hello world" example, and unit tests around the GroovyScriptEngine

The only convention that is enforced is that the groovy script must be a
class, and it must define a closure named "testRunner" - (this convention
is based on the convention used for the Jython scripts, and adapted to the
groovy-style camel case for closure names)

The work is here -

https://github.com/ryangardner/grinder/tree/groovy-script-engine

This is just my first crack at it, I am going to tinker with it and may end
up doing things differently (I might move away from pulling the closure out
and getting a callable and instead use the GroovyObject "invokeMethod" on
the script if it performs better).

I'm open to any comments about the implementation - I can clean it up and
then submit it to you to be merged in if you are interested.

As far as performance is concerned, when using Groovy 2.0's @CompileStatic
transformation the performance is comparable to the Jython script engine
for testing the Hello World logging (around 80000 TPS on my machine when
running with 10 threads). BUt when using a normal dynamic groovy without
static compilation it seems limited to about 17000 TPS on my machine with
10 threads.

I can provide a set of sample scripts for groovy and also provide some
additional documentation to go along with it. As of now I have only tested
a few basic scripts, but I expect it should work pretty nicely with the
existing grinder plugins and code.

Ryan

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