don't assume setup.py is run from its directory

when looking for the path to the regexes.yaml file, look relative to the
top directory containing setup.py, but don't assume it's the current
directory.

setup.py

@@ -13,7 +13,7 @@ def run(self):
         print 'Copying regexes.yaml to package directory...'
         import os
         import shutil
-        cwd = os.path.abspath('.')
+        cwd = os.path.abspath(os.path.dirname(__file__))
         yaml_src = os.path.join(cwd, 'regexes.yaml')
         yaml_dest = os.path.join(cwd, 'py', 'ua_parser', 'regexes.yaml')
         shutil.copy(yaml_src, yaml_dest)