- added (base) test cases for the lexer issues and 2 test files. The d="" luckily seems to 
  behave as expected (did crash in earlier versions)
- found the exact line in the CSS that failed (border with !important) and isolated the test
- updated names of the tests and files
- added a reference test for the non important line (which should always work).
- fixed small spelling error in the css parser.
- added trailing whitespace test for #399, which also crashes the lexer