BLD: Add versioneer to cimplify versioning

Add versioneer to simplify versioning for releases

Author: bashtage

.gitattributes

@@ -0,0 +1 @@
+pandas_datareader/_version.py export-subst

MANIFEST.in

@@ -4,3 +4,5 @@ include pandas_datareader/*.py
 
 include pandas_datareader/tests/*.py
 include pandas_datareader/tests/data/*
+include versioneer.py
+include pandas_datareader/_version.py

pandas_datareader/__init__.py

@@ -1,4 +1,12 @@
-__version__ = version = '0.5.0'
+from ._version import get_versions
+from .data import (get_components_yahoo, get_data_famafrench, get_data_google,
+                   get_data_yahoo, get_data_enigma, get_data_yahoo_actions,
+                   get_quote_google, get_quote_yahoo, DataReader, Options)
 
-from .data import (get_components_yahoo, get_data_famafrench, get_data_google, get_data_yahoo, get_data_enigma,  # noqa
-        get_data_yahoo_actions, get_quote_google, get_quote_yahoo, DataReader, Options)  # noqa
+__version__ = get_versions()['version']
+del get_versions
+
+__all__ = ['__version__', 'get_components_yahoo', 'get_data_enigma',
+           'get_data_famafrench', 'get_data_google', 'get_data_yahoo',
+           'get_data_yahoo_actions', 'get_quote_google', 'get_quote_yahoo',
+           'DataReader', 'Options']