EZID updating web target

[jdeck88]

Following message from John Kunze affects this codebase as there are hard-coded references to http://n2t.net/ezid.... Just an FYI :)

John Deck

Message from John Kunze:
As previously announced, EZID's URL was switched from http://n2t.net/ezid
to http://ezid.cdlib.org last night. If you have not already done so,
please update your bookmarks and API clients. As before, this means that

1. The URL for EZID's home page changed from http://n2t.net/ezid to
   http://ezid.cdlib.org .
2. The URL to EZID's API changed to http://ezid.cdlib.org .
3. The persistent links, expressed as URLs, of the ARKs and DOIs
   that EZID creates will not change.

While browsers will be redirected from the old URL to the new URL for at
least 1 year, the situation is different for API clients.

For API clients, direct PUT and POST requests against the old URL will be
supported for 1 month. If your API client is experiencing difficulty in
establishing a secure connection to the old URL, it is likely due to your
client's SSL library not supporting a feature called "TLS server name
indication support (RFC 4366)". The easiest remedy is simply to switch
your client to use the new URL, although it is also possible to configure
your client to be able to connect anyway, such as setting up a local
"trust store".

[mbjones]

Updated the EZID default URI endpoint for the service in sha 1dedb9a.