Emit archive ID when uploading a single file

Previously glacier-cmd truncated output with headers over 100
characters which elided the 138 character archive ID.  Fixed #163.

Author: gaul

glacier/glacier.py

@@ -34,7 +34,7 @@ def output_headers(headers, output):
     if output == 'print':
         table = PrettyTable(["Header", "Value"])
         for row in rows:
-            if len(str(row[1])) < 100:
+            if len(str(row[1])) <= 138:
                 table.add_row(row)
 
         print table