added description for food sale report
heading links to reports
got rid of the @reports ivar, now just doing everything by method name
pass in data to series formatter function instead of using global variables
changed food sale percentage computation to only add up alcoholic beverage sales vs. food sales
changed details to <ul>, simplified language
added hourly sales by day of week report (still needs work).  currently just sums for each hour, should provide an average instead
Merge branch 'feature/hourly_performance_report' into develop