DNN-5074 Add unit tests for FriendlyUrlController.CleanNameForUrl
DNN-5075 Correctly convert diacritics to ASCII
DNN-5074 More tests for CleanNameForUrl
DNN-5074 Misc cleanup/fixes in CleanNameForUrl
DNN-5074 Add performance test for CleanNameForUrl

It looks like there's probably a better way that y'all are doing automated perf
testing (or, at least, a plan for there to be), but hopefully this is helpful
enough for comparing perf improvements from the next commit...
DNN-5074 Use cached, compiled regex in FriendlyUrlOptions

This is mainly for perf, which goes from around 2.3 seconds to about 2.0 seconds
for 10000 iterations of a basic call to CleanNameForUrl (on my machine)
DNN-5074 Prefer normalizing strings to upper case, via invariant culture
DNN-5074 Don't do empty append
Merge pull request #93 from bdukes/DNN-5073-through-5075

DNN-5074 and DNN-5075 CleanNameForUrl perf and bug fix