remove type formatting of freq lims to allow None (#29)

Author: cjayb

stormdb/process.py

@@ -47,7 +47,7 @@ def raw_filter(self, in_fname, out_fname, l_freq, h_freq, **kwargs):
 
         script = ("from mne.io import read_raw_fif;"
                   "raw = read_raw_fif('{in_fname:s}', preload=True);"
-                  "raw.filter({l_freq:.1f}, {h_freq:.1f}{kwargs:});"
+                  "raw.filter({l_freq}, {h_freq}{kwargs:});"
                   "raw.save('{out_fname:s}')")
         filtargs = ', '.join("{!s}={!r}".format(key, val) for
                              (key, val) in kwargs.items())