Add default date params to law tree update api

Add two overload methods to the law tree updates api to allow for
use of default date range parameters.  The "from" date will default to
1970-01-01 and the "to" parameter will default to the current date time.

docs/api/laws.rst

@@ -397,9 +397,14 @@ To see updates to the content of law documents, see `Get law document updates`_.
 
 List of laws with tree updates during the given date/time range
 ::
+    /api/3/laws/tree/updates
+    /api/3/laws/tree/updates/{fromDateTime}
     /api/3/laws/tree/updates/{fromDateTime}/{toDateTime}
 
-.. note:: The fromDateTime and toDateTime should be formatted as the ISO Date Time format. For example December 10, 2014, 1:30:02 PM should be inputted as 2014-12-10T13:30:02. The fromDateTime and toDateTime range is exclusive.
+The fromDateTime and toDateTime should be formatted as the ISO Date Time format.
+For example December 10, 2014, 1:30:02 PM should be inputted as 2014-12-10T13:30:02.
+The fromDateTime and toDateTime range is exclusive.
+If excluded, fromDateTime defaults to Jan 1 1970 and toDateTime defaults to the current datetime
 
 
 **Optional Params**

src/main/java/gov/nysenate/openleg/controller/api/law/LawUpdatesCtrl.java

@@ -40,7 +40,7 @@ public class LawUpdatesCtrl extends BaseCtrl
     @Autowired private LawUpdatesDao lawUpdatesDao;
 
     /**
-     * Law Updates API (for all laws)
+     * Law Document Updates API (for all laws)
      * ------------------------------
      *
      * Usages:
@@ -70,6 +70,34 @@ public BaseResponse getAllUpdates(@PathVariable String from, @PathVariable Strin
         return getAllUpdates(parseISODateTime(from, "from"), parseISODateTime(to, "to"), request);
     }
 
+    /**
+     * Law Tree Updates API
+     * ------------------------------
+     *
+     * Usages:
+     * (GET) /api/3/laws/tree/updates
+     * (GET) /api/3/laws/tree/updates/{from date-time}
+     * (GET) /api/3/laws/tree/updates/{from date-time}/{to date-time}
+     *
+     * date parameters default to 1970-01-01 and now respectively
+     *
+     * Request Params: type (string) - Update type (processed, published) Default: published
+     *                 limit, offset (int) - Paginate
+     *                 order (string) - Order by update date
+     *
+     * Expected Response: List of UpdateTokenView<LawVersionId>
+     */
+    @RequestMapping(value = "/tree/updates")
+    public BaseResponse getLawTreeUpdates(WebRequest request) {
+        return getLawTreeUpdates(null, null, request);
+    }
+
+    @RequestMapping(value = "/tree/updates/{from:.*\\.?.*}")
+    public BaseResponse getLawTreeUpdates(@PathVariable String from,
+                                          WebRequest request) {
+        return getLawTreeUpdates(from, null, request);
+    }
+
     @RequestMapping(value = "/tree/updates/{from:.*\\.?.*}/{to:.*\\.?.*}")
     public BaseResponse getLawTreeUpdates(@PathVariable String from,
                                           @PathVariable String to,