Use bundle exec sass in Makefile
Use bundle exec sass in Makefile

* Travis container installs to bundle/vendor that's not in PATH.

intfrr/redmine_dashboard,intfrr/redmine_dashboard,jmfarina/redmine_dashboard,intfrr/redmine_dashboard,intfrr/redmine_dashboard,jmfarina/redmine_dashboard,jmfarina/redmine_dashboard,jmfarina/redmine_dashboard