Workaround for permalink problems on non-conformant HTML5 parsers

Some HTML5 parser do not correctly parse a permalink containing key-value-pairs starting with named character sequences, e.g. `&timespan=...` (will be parsed as &times;). Read here for more details:

http://stackoverflow.com/questions/15532252/why-is-reg-being-rendered-as-%C2%AE-without-the-bounding-semicolon