version 1.000
Lab2 initial stage
version 1.001
Added Merchandise and Purchase classes
Added IMerchandise and IPurchase interfaces
Implemented Merchandise class
Started implementation of Purchase class
Finished implementation of current IPurchase<T> interface
Added IEquatable interface to IMerchandise
Changed some unwanted behaviour to correct
version 1.003
Some Bugfixes
Added Unit Tests
version 1.004
Added Unit Tests for Purchase class
Small bug fixes
Merge branch 'lab2'