Merge pull request #1 from tfreier/master

These Queries should work
In this version:
- the ratio "Day of week" is done.
- the price of each product is now generated randomly, within a range.
- the ratio "product price" is on process, and there are problems with
product name.
- besides, new variables like NoOfDayInTotal, or TotalSalePerDay... were
made to shorten the code.
In this version,
the ratio: price of product is added.
However the calculation of the function y=ax + b is still much manually.
The price of a product is now generated for each day => 1 product has 1
fixed price for 1 day.
The forecast for next week is tried.
This is the updated version of 14.03.2013
using lists and maps

Change-Id: I819e52cecf5dacfcc6a999a9925a03225dcca0f3