Pass options to coverage compiler

By passing the options to the coverage compiler it is possible to e.g. set the coverage variable or enable bare compiling.

I was trying to compile with coverage for a frontend project and needed the `bare` option. Usage example could be:

```
config.coffeeCoverage =
	compile:
		options:
			bare: true
		src:  'src.coffee'
		dest: 'dest.coverage.js'
```