prepare to add scroll spy
Draft code added.
Next step to right layout.
Applying solutions from stackoverflow.
Events layout added.
Lectors layout added.
Events2.0 layout added.
Affix script added.
Debug removed & some refactoring.
add scroll spy
add select active item
Affix layout improved.
Merge branch 'feature/add_scroll_spy_#170' into staging

Conflicts:
	app/assets/javascripts/custom.js.coffee
	app/views/layouts/web/shared/_navigation.html.haml
	app/views/web/events/index.html.haml
	app/views/web/lectors/index.html.haml