fixed backtotop button positioning on ipad
Merge pull request #33 from davidamador/btt-ipad

fixed backtotop button positioning on ipad (merge)
reverting popup positioning updates from pull request #30
Merge pull request #34 from davidamador/dynpos-unfix

reverting popup positioning updates from pull request #30
fixed css for backtotop button
removed backtotop alt text from demos
backtotop button tweaks per UX
Merge pull request #38 from davidamador/btt-adjustments

backtotop button tweaks per UX (merge)
adding spinner component
Merge pull request #39 from davidamador/spinners

adding spinner component (merge)
manual merge of #37