Google Fonts Improvement Project: Josefin Sans Proposal

Taking in feedback from @Reed Reibstein and Dave Crossland
( You can see the discussion on google groups: https://groups.google.com/forum/#!topic/googlefonts-discuss/v4RUY3u2HW4 )

Added more joint arching to harmonize the /g with the /n family.
Added more of an overbite to the /e
Widened the half round family members [/a/g/d/b]

Thanks Reed and Dave for your input!