* Add further tests with quotes.
* Handle prefix in strings.
* Remove old originalTokenContent which is no longer in use, as we use
str_replace, introduced in earlier commit.
Relates: #72
* Make MissingNamespaceSniff work again.
* Move to old namespace as it's a custom sniff, not a general one.
* Do not use new feature here, implement logic internal.
* Remove message from ruleset, use it directly.
Relates: #72
