Add some more aliases.

cereal/__init__.py

@@ -277,6 +277,8 @@ class Sequence(Positional):
 
         return result
 
+Seq = Sequence
+
 class String(object):
     """ A type representing a Unicode string """
     def __init__(self, encoding='utf-8'):
@@ -297,6 +299,8 @@ class String(object):
     def deserialize(self, struct, value):
         return self._validate(struct, value)
 
+Str = String
+
 class Integer(object):
     """ A type representing an integer """
     def _validate(self, struct, value):
@@ -361,6 +365,8 @@ class Structure(object):
     def add(self, struct):
         self.structs.append(struct)
 
+Struct = Structure
+
 class _SchemaMeta(type):
     def __init__(cls, name, bases, clsattrs):
         structs = []