Support for efficient loading of maxrank vectors in the binary format.
Bugfix in unicode handling in Vocabulary.loadf
Merge branch 'master' of github.com:spyysalo/wvlib into feat-subset

Conflicts:
	wvlib.py
Adding a dummy __init__.py so that wvlib can be used as a library easily.
Merge pull request #4 from fginter/master

Efficient read of max_rank from binary files