Adds Transliterate Filter

What this does
---
 - This transliterates input so that non-ascii characters can be properly escaped

    # Replaces non-ASCII characters with an ASCII approximation, or if none
    # exists, a replacement character which defaults to "?".

 - This removes a duplicated test, adds a missing test, and a new test for transliterate

Example: àáâãäå -> aaaaaa