ENH: Provides aliases for the (Date|Time)RuleFactory classes for better Quantopian/Zipline interoperability

zipline/utils/events.py

@@ -44,6 +44,8 @@ __all__ = [
     # Factory API
     'DateRuleFactory',
     'TimeRuleFactory',
+    'date_rules',
+    'time_rules',
     'make_eventrule',
 ]
 
@@ -494,6 +496,11 @@ class TimeRuleFactory(object):
     market_close = BeforeClose
 
 
+# Convenience aliases.
+date_rules = DateRuleFactory
+time_rules = TimeRuleFactory
+
+
 def make_eventrule(date_rule, time_rule, half_days=True):
     """
     Constructs an event rule from the factory api.