Renaming files
Updating README
Adding OFL.txt

Correct copyright in SFD
Fixing vertical metrics

TTF fixed with:

$ fontbakery-fix-vertical-metrics.py --autofix Bhavuka-Regular.ttf; mv
Bhavuka-Regular.ttf.fix Bhavuka-Regular.ttf
Merge pull request #1 from fontdirectory/master

License, v metrics, filenames