obtains @day with before_action for total
(style) from tabs to spaces
Decouples total calculation from Day#total. closes #8
adds columns for O and D Stats to Weeks
adds oAVG and dAVG on Week List template
(style) tabs to spaces
change column type Week. oAVG dAVG to float. closes #9
adds Week#calculateStats
adds WeeksController#stats

before_action :set_week
supports week.oAVG and week.dAVG on templates
adds js response for WeeksController#stats
adds route for 'stats'

stats_week_path(@week)
(style) tabs to spaces
prefixes styles for Interaction (highlight)
(style) tabs to spaces
adds Highlight Interaction to stats buttons
calculaste MAXs and MINs in Week#calculateStats
shows stats on Week page
button text from "Stats" to "Get stats"
Merge branch 'show-week-brief'