remove string ',' in quote price (#335)

* remove string ',' in quote price

replace(',','')
this will facilitate the conversion from string to float, and avoid exception

* remove string ',' in quote price

this string ',' removal is especially important for handling index price
e.g. INDEXHANGSENG:HSI
the original quote price is a string with ',' to show the thousand price point
which will cause error when converting to float

edited for PEP8
this is a re-summit as Im seeing some requests on this issue, wish could pass the test

Author: silau2005

pandas_datareader/google/quotes.py

@@ -28,7 +28,7 @@ def _read_lines(self, out):
         buffer = out.read()
         m = re.search('// ', buffer)
         result = json.loads(buffer[m.start() + len('// '):])
-        return pd.DataFrame([[float(x['cp']), float(x['l']),
+        return pd.DataFrame([[float(x['cp']), float(x['l'].replace(',', '')),
                               np.datetime64(parse(x['lt']).isoformat())]
                              for x in result], columns=['change_pct',
                                                         'last', 'time'],