Delete gather_freqs.py

This script was in a broken state, and should be unnecessary. The functionality is subsumed by `get_freqs.py`

bin/gather_freqs.py

@@ -1,29 +0,0 @@
-from __future__ import unicode_literals
-import plac
-import io
-
-def main(in_loc, out_loc):
-    this_key = None
-    this_freq = 0
-    df = 0
-    with io.open(out_loc, 'w', encoding='utf8') as out_file:
-        for line in io.open(in_loc, encoding='utf8'):
-            line = line.strip()
-            if not line:
-                continue
-            freq, key = line.split('\t', 1)
-            freq = int(freq)
-            if this_key is not None and key != this_key:
-                out_file.write('%d\t%d\t%s\n' % (this_freq, df, this_key))
-                this_key = key
-                this_freq = freq
-                df = 1
-            else:
-                this_freq += freq
-                df += 1
-                this_key = key
-        out_file.write('%d\t%d\t%s\n' % (this_freq, df, this_key))
-
-
-if __name__ == '__main__':
-    plac.call(main)