Normalize path

Improve URLs created from site titles containing special characters:

1. convert characters like [:;-()] (Regex, and similar) to a single "-". Keep URL search-engine-friendly (retain umlauts)
2. concatenate subsequent "-" chars into one single "-" (Do this step after step 1 to avoid duplicate "-" chars, remove trailing and leading dash
3. Do not trunk long URLs

See also #255 
