Regex support for Include/Exclude

[patrickposner]

We should offer real regex support for the settings in General:

• Include (URLs + Files)
• Exclude

[cschmitt-mpi]

thumbs up: we for example want to exclude any */feed/ URL which is a pain without the abiility of using regex.

[patrickposner]

@cschmitt-mpi we will add an option in the next release to exclude all feed-related URLs - it's not as good as full regex support, but it should make things easier 🙂