ENH: Add nipype exceptions

Author: effigies

nipype/exceptions.py

@@ -0,0 +1,26 @@
+class NipypeError(Exception):
+    pass
+
+
+class PipelineError(NipypeError):
+    pass
+
+
+class NodeError(EngineError):
+    pass
+
+
+class WorkflowError(NodeError):
+    pass
+
+
+class MappingError(NodeError):
+    pass
+
+
+class JoinError(NodeError):
+    pass
+
+
+class InterfaceError(NipypeError):
+    pass