Added CLI for ChanceJS
Allows you to invoke any generator from the command line. Like so:
```shell
$ chance name
Ruby Cannon
```

Options can be set by providing them as a JSON-formatted parameter. Like so:
```shell
$ chance color {\"middle\":true}
rgb(84,26,130)
```
Merge pull request #122 from oliversalzburg/feature/cli

Added CLI for ChanceJS