Fix fnmatch

fnmatch does not accept regular expressions as presumed in
0c4851e436 See
http://docs.python.org/2/library/fnmatch.html

This patch actually completely broke tagging. All we need to do is make
sure any [ or ] used is conbverted into [[] or []].

Fixes #2557 and  #2362

couchpotato/core/helpers/variable.py

@@ -11,6 +11,9 @@ import sys
 
 log = CPLog(__name__)
 
+def fnEscape(pattern):
+    return pattern.replace('[','[[').replace(']','[]]').replace('[[','[[]')
+
 def link(src, dst):
     if os.name == 'nt':
         import ctypes