ry start

Using `ry.deps.lock` in preference to `ry.deps`, launch `reaktor` using classpath resolved by `rym install`, with artifacts cached in `~/.ry/cache`.

```
$ ls
ry.deps

$ java -jar rym.jar install
Resolving dependencies
...
Dependencies successfully resolved

$ ls
ry.deps
ry.deps.lock

$ java -jar ry.jar start
Reaktor started
```
