Removes unused module.

Looks like this was used for keeping state in the 0MQ-heavy world.

zipline/transitions.py

@@ -1,69 +0,0 @@
-import types
-from collections import Container, Hashable, Callable
-
-class Any(object): pass
-
-class Workflow(Container, Callable):
-
-    def __init__(self, states, transitions, initial_state):
-        self.simple = set()
-        self.complx = []
-
-        if isinstance(states[0], tuple):
-            self.groups = {b for _,b in states}
-        else:
-            self.groups = set()
-
-        matcher = lambda b: lambda f,t : t == b
-
-        for (a, b) in transitions.itervalues():
-            if a is Any:
-                self.complx.append(matcher(b))
-            if isinstance(a, Hashable) and isinstance(b, Hashable):
-                self.simple.add((a,b))
-
-    def __call__(self, **kwargs):
-        if 'group' in kwargs:
-            return self.groups
-
-    def __contains__(self, state):
-        if state in self.simple:
-            return True
-        for match in self.complx:
-            if match(*state):
-                return True
-        else:
-            return False
-
-class WorkflowMeta(type):
-    """
-    Base metaclass component workflows.
-    """
-
-    def __new__(cls, name, mro, attrs):
-        base          = 'Component'
-
-        state         = attrs.get('states', None)
-        transitions   = attrs.get('transitions', None)
-        initial_state = attrs.get('initial_state', None)
-
-        if not 'abstract' in attrs:
-
-            if attrs.get('workflow'):
-                raise RuntimeError('`workflow` is a reserved attribute.')
-
-            if not state:
-                raise RuntimeError('Must specify states')
-
-            if not transitions:
-                raise RuntimeError('Must specify transitions')
-
-            if not transitions:
-                raise RuntimeError('Must specify initial_state')
-
-        new_class = super(WorkflowMeta, cls).__new__(cls, name, mro, attrs)
-
-        if not 'abstract' in attrs:
-            new_class.workflow = Workflow(state, transitions, initial_state)
-
-        return new_class