submitted, refactored version of ruby_fund_3.rb
Ruby Fund. 4 work from 11-21-13
added cashier program w/ hch edits
added working file change4.rb; updated hch version but not using this anymore so can ignore
now have working calc_subtotal methods & prints out subtotals & order summary
sales section of program runs successfully with new data structures
now pushes sale to sales.csv; appended somple sales to sales.csv