Clean up the tests code. Fix unintentional variable typos.

* `testStrippers()` was using `$string` instead of `$commaString` for `$newString2`.
* `testPhrase()` was setting `$string` twice instead of `$commaString` the second time.
* Standardized whitespace.
Merge pull request #2 from markjaquith/issue/clean-up-tests

Clean up the tests code. Fix unintentional variable typos.