Updated active class to top most nav section in view

Added an in-view class for all nav sections in view
Merge branch 'v2.0' of https://github.com/jimmynotjim/scrollNav into feature/active-class-update

# Via James Wilson (1) and Jimmy Wilson (1)
* 'v2.0' of https://github.com/jimmynotjim/scrollNav:
  Added arrow key navigation option

Conflicts:
	dist/jquery.scrollNav.js
	dist/jquery.scrollNav.min.js
Merge pull request #24 from jimmynotjim/feature/active-class-update

Active class update