Merge branch 'UnitClassTesting' into 'master'

Documentation/AcceptanceTests.md

Documentation/UML_Diagram.pdf

Documentation/UserStories.md

EclipseProject/src/main/java/Main.java

...oject/src/main/java/exceptions/BidBelowZeroException.java

...ct/src/main/java/exceptions/CategoryInvalidException.java

...roject/src/main/java/exceptions/DateInvalidException.java

...src/main/java/exceptions/DescriptionInvalidException.java

...oject/src/main/java/exceptions/ImageInvalidException.java

...ct/src/main/java/exceptions/ItemNonExistentException.java

...oject/src/main/java/exceptions/LoginInvalidException.java

...roject/src/main/java/exceptions/MailInvalidException.java

...ct/src/main/java/exceptions/PasswordInvalidException.java

...oject/src/main/java/exceptions/PriceInvalidException.java

...Project/src/main/java/exceptions/SSSInvalidException.java

...oject/src/main/java/exceptions/TitleInvalidException.java

...src/main/java/exceptions/UsernameEmailEmptyException.java

...ct/src/main/java/exceptions/UsernameInvalidException.java

EclipseProject/src/main/java/project/Auction.java

EclipseProject/src/main/java/project/AuctionBeater.java