relax path requirement to not require fdsnws

[crotwell]

Current (1.2) spec says:

The following base URI pattern is to be used at each data center implementing FDSN services: <site>​/fdsnws/<service>/<majorversion>/

But that limits datacenters to a single instance of each type of web service, and this requirement is already an issue, for example IRIS with the PH5 repository at:
http://service.iris.edu/ph5ws/dataselect/1

So, maybe should relax this requirement by saying a compliant service url should be
<site>​/<repository>/<service>/<majorversion>/
where <repository> can be defined by the datacenter if needed, but the primary url for a fdsn web service with a datacenter should have repository be 'fdsnws'.

[javiquinte]

Very good suggestion.

[chad-earthscope]

I support a slight relaxation of this pattern as well. I've heard multiple folks express the opinion that that the consistent path pattern was very valuable, a requirement to use 'fdsnws' for the primary repository strikes a good balance.