Merge pull request #1331 from cni-md/master

epi_param.txt: missing acc_factor added. epi_acc renamed to acc_factor?

Author: satra

nipype/testing/data/epi_param.txt

@@ -4,7 +4,7 @@
     "delta_te": 2.46e-3,
     "epi_factor": 128,
     "epi_lines": 57,
-    "epi_acc": 2,
+    "acc_factor": 2,
     "field_strength": 3.0,
     "field_axis": "z"
 }