Initial code to start dispatching coprocessor events.

This code doesn't work yet.
Exclude HBase's old JRuby.
Add JCL dependency.

JCL is a library which will let us properly load a modern JRuby from
within an HBase coprocessor.
Rename `.jars` to `jars`.
Add runtime dependencies to gem output.
Add `jars` to require_paths.
Load runtime dependencies from gem directly.
Move classpath helpers into `askari` and publish `runtime_classpath`.
Actually, let's just unpack our dependent JARs since it means we don't
have to use two custom classloaders.
Actually, just dump everything into the `classes` directory.

This keeps the Askari::Packaging module simple.
Use ChildFirstClassLoader from http://articles.qos.ch/classloader.html.

JCL does not properly implement the ClassLoader.getResource function,
and thus does not work for embedding JRuby. I've submitted a pull
request for partially implementing this support, but I don't know if
it will be accepted upstream.

https://github.com/kamranzafar/JCL/pull/10

If JCL does eventually accept that pull request we can switch back to
using it instead of this bare bones class loader.
Fix class loading issue due to URLClassLoader's parent-first policy.
Drop JCL dependency for now.
Remove `mrproper` task.

It's just a bad idea.
Map ruby code to root where JRuby expects to load it.
Fix modelines.
Ensure subcommands in integration test actually succeed.
Refactor coprocessor implementation into loaded ruby script.

This takes us one step closer to a working integration test.
Hooray, passing specs!
Merge pull request #4 from seomoz/spiking-coprocessor-dispatch

Spiking coprocessor dispatch