jcov check shows weird output with command line switches

We have duplicate-ish lines:
**dump: false**
**:dump: true**

```
$ jcov check --dump
Using configuration file: ./jcov.yml

---
test_directory: tests
source_directory: javascripts
test_runner: jasmine/runner.js
error_field: results
report_output_directory: jcov
verbose: false
color: true
coverage: true
report: false
dump: false
:dump: true
ignore:
- jasmine
- tests
```
