New test suite

[paulyoung]

Probably mocha.

• [x] Test runner
• [x] Parser tests
• [ ] Import statement tests
• [x] Reporter tests
• [ ] Test cases / fixtures for reported bugs

[paulyoung]

I think what the remaining checkbox equates to is to add test cases for the remaining open issues that relate to the v3 parser.

These should be added as CSS files in /spec/fixtures/input and /spec/fixtures/output/parser.

[paulyoung]

My intention with the remaining checkbox was essentially to make sure the following issues were addressed:

• [ ] #10
• [ ] #15
• [ ] #23
• [ ] #24
• [ ] #38
• [ ] #52