Update bower to 1.7.0
Update bower to 1.7.0

https://github.com/bower/bower/releases/tag/v1.7.0

zoomer/heroku-buildpack-ruby-bower,moneyadviceservice/heroku-buildpack-ruby-bowndler,qnyp/heroku-buildpack-ruby-bower,moneyadviceservice/heroku-buildpack-ruby-bowndler,zoomer/heroku-buildpack-ruby-bower,qnyp/heroku-buildpack-ruby-bower