Change log messages to avoid string format TypeError.

Was getting the following errors from the Flask logger:

    127.0.0.1 - - [18/Jul/2014 01:33:56] "GET /data/results/?platform=android4.0 HTTP/1.1" 200 -
    Traceback (most recent call last):
      File "/usr/lib/python2.7/logging/__init__.py", line 851, in emit
        msg = self.format(record)
      File "/usr/lib/python2.7/logging/__init__.py", line 724, in format
        return fmt.format(record)
      File "/usr/lib/python2.7/logging/__init__.py", line 464, in format
        record.message = record.getMessage()
      File "/usr/lib/python2.7/logging/__init__.py", line 328, in getMessage
        msg = msg % self.args
    TypeError: not all arguments converted during string formatting
    Logged from file server.py, line 132

---

    127.0.0.1 - - [18/Jul/2014 01:34:26] "GET /data/platform?platform=android4.0 HTTP/1.1" 301 -
    Traceback (most recent call last):
      File "/usr/lib/python2.7/logging/__init__.py", line 851, in emit
        msg = self.format(record)
      File "/usr/lib/python2.7/logging/__init__.py", line 724, in format
        return fmt.format(record)
      File "/usr/lib/python2.7/logging/__init__.py", line 464, in format
        record.message = record.getMessage()
      File "/usr/lib/python2.7/logging/__init__.py", line 328, in getMessage
        msg = msg % self.args
    TypeError: not all arguments converted during string formatting
    Logged from file server.py, line 319

Feel free to merge if you have this problem as well =)