Silence warnings on initialization.

Author: gaffney2010

axelrod/__init__.py

@@ -1,5 +1,9 @@
 DEFAULT_TURNS = 200
 
+# We allow behavior at initialization that we don't want users to do.
+import warnings
+warnings.simplefilter('ignore', category=UserWarning)
+
 # The order of imports matters!
 from axelrod.version import __version__
 from axelrod.load_data_ import load_pso_tables, load_weights
@@ -22,3 +26,5 @@
 from axelrod.result_set import ResultSet
 from axelrod.ecosystem import Ecosystem
 from axelrod.fingerprint import AshlockFingerprint, TransitiveFingerprint
+
+warnings.simplefilter('default', category=UserWarning)