BUG: Enable return values on first day using minute TALib functions.

Set the `compute_only_full` to False so that the 'is window full' logic
is delegated to the TALib's lookback function.
If the window is not full to the `timeperiod` or other lookback setting,
then TALib returns a `np.nan`.

Also, fix the bars/data_frequency not being passed to the BatchTransform
init.
This further shows need to create a minute test for TALib transforms.

zipline/transforms/ta.py

@@ -163,7 +163,9 @@ def make_transform(talib_fn, name):
             super(TALibTransform, self).__init__(
                 func=zipline_wrapper,
                 refresh_period=refresh_period,
-                window_length=window_length)
+                window_length=window_length,
+                compute_only_full=False,
+                bars=bars)
 
         def __repr__(self):
             return 'Zipline BatchTransform: {0}'.format(