Remove `describe` block
Refactor Configuration tests
Test new Configuration option to set root as an absolute path
Simplify `smell_location_path` method

Now, it simply manipulates the location parameter and passes it on to
the `file_path` method.
Test ViewHelpers main methods: `file_path` and `asset_path`
Test AnalysedFile's `complexity_per_method` method
Test Analyser::Stats