aniDBfileInfo.py get_file_size returns 0

I ran into a case where the get_file_size function in aniDBfileInfo.py is returning a value of 0 for a file that is 280MB in size.  When I changed the following code:

```
f = open(path)
size = len(f.read())
```

to:

```
size = os.path.getsize(path)
```

I now get the correct file size.

Also wouldn't "size = len(f.read())" be slow are very large files?
