Allow new special characters to profile names

[daniel tygel]

We're working in the networks plugin, which will add a new profile, 
called Networks.

Since they are hierarchical with arbitrary levels, we are thinking of 
nice ways to display the URLs of the nodes inside each network.

For example: Network has Child1 as a first level child node. And Child1 
has Child11 as its own child node. Our proposal is that the url of the 
Child11 profile has a "pathway" format, like this:

/network::child1::child11

Today, only "-", ".", "~" and "_" are allowed, but URLs can accept ":", 
"|" and "*" as other valid options.

We are willing to allow these 3 characters ( : | * ) to be used in 
profile urls. Is there any problem if we do a merge-request for that?

Thanks,

daniel and braulio

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