Re-layout incident details page, allow deleting incident events
First pass at clients screen
Cosmetic tweaks and more configurability to per-chapter incident settings
Fix incident report showing affected instead of total units
Calendar should not render a shift group that has no active shifts
Tweak incident controller specs to turn on the relevant features in chapter config
Store chapter with cas incident, only link for current chapter's incidents.  Fix small issue in incident#show in _versions when there aren't any edits yet.
Have travis ignore the browser stuff for now.