Add better error handling to print errors from spreadsheet login.

Author: tdicola

examples/google_spreadsheet.py

@@ -88,8 +88,9 @@ def login_open_sheet(oauth_key_file, spreadsheet):
 		gc = gspread.authorize(credentials)
 		worksheet = gc.open(spreadsheet).sheet1
 		return worksheet
-	except:
+	except Exception as ex:
 		print 'Unable to login and get spreadsheet.  Check OAuth credentials, spreadsheet name, and make sure spreadsheet is shared to the client_email address in the OAuth .json file!'
+		print 'Google sheet login failed with error:', ex
 		sys.exit(1)