Bugfix: meta-overwrite-url with special characters
Bugfix: meta-overwrite-url with special characters

Overwriting an url which contains special characters like é is not possible and always gives an URLAlreadyExists-error message.
Steps to reproduce:
Change a title by adding 'é test'
Go to the SEO tab and overwrite the url to 'é-test-something' and try to save

jacob-v-dam/forkcms,jeroendesloovere/forkcms,Katrienvh/forkcms,WouterSioen/forkcms,jessedobbelaere/forkcms,riadvice/forkcms,riadvice/forkcms,jessedobbelaere/forkcms,mathiashelin/forkcms,jonasdekeukelaere/forkcms,vytenizs/forkcms,WouterSioen/forkcms,carakas/forkcms,DegradationOfMankind/forkcms,tommyvdv/forkcms,ikoene/forkcms,tommyvdv/forkcms,matthiasmullie/forkcms,dmoerman/forkcms,jeroendesloovere/forkcms,jessedobbelaere/forkcms,forkcms/forkcms,bartdc/forkcms,justcarakas/forkcms,DegradationOfMankind/forkcms,jeroendesloovere/forkcms,DegradationOfMankind/forkcms,Saxithon/gh-pages,ikoene/forkcms,forkcms/forkcms,jessedobbelaere/forkcms,carakas/forkcms,sumocoders/forkcms,DegradationOfMankind/forkcms,carakas/forkcms,nosnickid/forkcms,ikoene/forkcms,Thijzer/forkcms,vytsci/forkcms,mathiashelin/forkcms,jonasdekeukelaere/forkcms,jacob-v-dam/forkcms,Katrienvh/forkcms,Saxithon/gh-pages,bartdc/forkcms,jonasdekeukelaere/forkcms,jacob-v-dam/forkcms,Thijzer/forkcms,riadvice/forkcms,jonasdekeukelaere/forkcms,mathiashelin/forkcms,vytsci/forkcms,tommyvdv/forkcms,nosnickid/forkcms,Katrienvh/forkcms,carakas/forkcms,bartdc/forkcms,forkcms/forkcms,justcarakas/forkcms,wengyulin/forkcms,jonasdekeukelaere/forkcms,carakas/forkcms,mathiashelin/forkcms,sumocoders/forkcms,wengyulin/forkcms,vytsci/forkcms,nosnickid/forkcms,wengyulin/forkcms,sumocoders/forkcms,dmoerman/forkcms,sumocoders/forkcms,sumocoders/forkcms,vytenizs/forkcms,Katrienvh/forkcms,Thijzer/forkcms,tommyvdv/forkcms,forkcms/forkcms,matthiasmullie/forkcms,jacob-v-dam/forkcms,matthiasmullie/forkcms,riadvice/forkcms,vytenizs/forkcms,justcarakas/forkcms,dmoerman/forkcms,jeroendesloovere/forkcms