Merge branch 'release/2.1.0'
Merge pull request #131 from antistatique/dev

Release 2.1.1
Merge branch 'release/2.1.2'
Merge branch 'release/2.1.3'
Merge branch 'release/2.1.4'
Merge branch 'release/2.1.5'
remove `<br>` tags in main navigation
fix #209
change appearance of active chunk in process nav
fix #216
fix tab-focus styles
ref #228
add autoplay to tab-focus element
fix #228
remove fade and add hover stop for focus element
rel #228
enhance collapse scripts with BS default events
fix tab focus outlines
fix nav-main focus effect
attempt at improving drilldown
fix #215
update text about browser compatibility
fix #189
remove fade from styleguide example
ref #22
add aria-attributes and hidden heading to breadcrumb
ref #211
add aria attributes to carousel
rel #213
fix error with carousel buttons bg on IE
fix #177