Improve accessibility of toggle button
Remove unused CSS class from markup
Add role to anchor to improve accessibility
Fix negative header negative indent

Use of .row class implies use of .col-* class - otherwise content has
negative indent.
See:
http://www.helloerik.com/the-subtle-magic-behind-why-the-bootstrap-3-gri
d-works
Merge branch 'fix/html-semantics' of https://github.com/peterblazejewicz/generator-aspnet into peterblazejewicz-fix/html-semantics
Merge branch 'peterblazejewicz-fix/html-semantics'