docs(README): move to .rst extension

MANIFEST.in

@@ -3,3 +3,4 @@ include */*.py
 recursive-include data external_resources *.gif *.png *.css *.ico *.js
 recursive-include i18n *.pot *.po
 recursive-include wdoc *
+include README.rst

setup.py

@@ -39,8 +39,8 @@ STD_BLACKLIST = ('CVS', '.svn', '.hg', 'debian', 'dist', 'build')
 
 IGNORED_EXTENSIONS = ('.pyc', '.pyo', '.elc', '~')
 
-if exists('README'):
-    long_description = file('README').read()
+if exists('README.rst'):
+    long_description = file('README.rst').read()
 else:
     long_description = ''
 if USE_SETUPTOOLS: