Only use mb_detect_encoding() if no charset is set in HTML
Refined spiegel.de xpatharticleenhancer

This xpathenhancer does not result in empty bullet points at the top of
article. It also adds the authors name/sign at the end of the article.
Added androidpolice.com xpathenhancer
Use one regular expression instead of two for charset detection
Merge pull request #664 from chaotix-/androidpolice-spiegel-enhancers

Refined spiegel.de enhancer and added androidpolice.com