tweak to font-size of iconbuttons so that applications of font-size to the x-iconbutton isn't overridden by the label
selectively toggling readonly on datepicker's text input to prevent mobile keyboard from popping up
add weekday labels to calendar; modify days to be percentages of months, allowing more responsive styling by editing a single month's width instead of each day
Merge branch 'master' of github.com:mozilla/app-components