Added code to ignore certain files

As per issue 1853, ignoring certain OSX metadata.

sickbeard/postProcessor.py

@@ -51,6 +51,7 @@ class PostProcessor(object):
     EXISTS_SMALLER = 3
     DOESNT_EXIST = 4
 
+    IGNORED_FILESTRINGS = [ "/.AppleDouble/", ".DS_Store" ]
     def __init__(self, file_path, nzb_name = None):
         # absolute path to the folder that is being processed
         self.folder_path = ek.ek(os.path.dirname, ek.ek(os.path.abspath, file_path))
@@ -597,6 +598,10 @@ class PostProcessor(object):
         if os.path.isdir( self.file_path ):
             self._log(u"File "+self.file_path+" seems to be a directory")
             return False
+        for ignore_file in self.IGNORED_FILESTRINGS:
+            if ignore_file in self.file_path:
+                self._log(u"File {0} is ignored type, skipping".format( self.file_path ) )
+                return False
         # reset per-file stuff
         self.in_history = False