Remove invalid regex on user ID

api/api.py

@@ -33,7 +33,7 @@ routing_regexes = {
     'sid': '[0-9a-z_]{0,24}',
 
     # User ID: any length, [0-9a-z.@_-]
-    'uid': '[0-9a-z.@_-]*',
+    'uid': '[0-9a-zA-Z.@_-]*',
 
     # Container name
     'cname': 'projects|sessions|acquisitions|collections',

raml/schemas/definitions/user.json

@@ -2,9 +2,7 @@
   "$schema": "http://json-schema.org/draft-04/schema#",
   "definitions": {
     "_id":              {
-                          "maxLength": 64,
-                          "minLength": 2,
-                          "pattern": "^[0-9a-z.@_-]*$",
+                          "format": "email",
                           "title": "ID",
                           "type": "string"
                         },