Include User-Agent Header in Calls to ONCat API (#6)

* Add user agent info as header to ONCat API calls.

* Actually pass request object to urllib...

* Use a more standard format agent string.

scripts/finddata

@@ -7,9 +7,9 @@ import os
 import re
 import sys
 try:
-    from urllib import urlopen
+    from urllib2 import Request, urlopen
 except ImportError:
-    from urllib.request import urlopen
+    from urllib.request import Request, urlopen
 from finddata import __version__
 
 BASE_URL = 'https://oncat.ornl.gov/'
@@ -56,7 +56,9 @@ def procNumbers(numbers):
 
 def getJson(endpoint):
     url = BASE_URL + endpoint
-    handle = urlopen(url)
+    req = Request(url)
+    req.add_header('User-Agent', 'Finddata/' + __version__)
+    handle = urlopen(req)
     if handle.getcode() != 200:
         raise RuntimeError('{} returned code={}'.format(url, handle.getcode()))
     doc = handle.read().decode()