Python `file-magic` Log of Changes

`0.4.1`

Create threadlocal objects so that the detect_from_* methods work properly

`0.4.0`

Sync with current version of file:
- Retain python 2 compatibility, factoring out the conversion functions.
- Avoid double encoding with python3
- Restore python-2 compatibility.

`0.3.0`

Fix setup.py so we can upload to PyPI
Add function detect_from_filename
Add function detect_from_fobj
Add function detect_from_content