Added price/weight heuristics
Updated parallel runner for testing
Added error messurement
Fixed parsing of items count from instance file name
Updated implementation of priceweight heuristics
Fixed missing condition for error mesuring
Updated Makefile

Added comments and used priceweight heuristics
Updated items count for priceweight heuristics in Makefile
Implemented measure of minimum and maximum times
Merge pull request #1 from stekycz/feature/price-weight

Added price/weight heuristics