Make sure that cave parser only reads .html files in cave_data dir (to stop foo~ causing 'duplicate cave' error)

parsers/caves.py

@@ -17,6 +17,7 @@ def readcaves():
       readentrance(filename)
   print "Reading Caves"
   for filename in os.walk(settings.CAVEDESCRIPTIONS).next()[2]: #Should be a better way of getting a list of files
+    if filename.endswith('.html'):
       readcave(filename)
 
 def readentrance(filename):