Mavenized
Update Potato.java

Improved condiment list.
Made compiled JAR executable
Added package
Everyone loves broccoli
What about ketchup?
Update Potato.java
Added: Pull Request rules
Updating to 1.7.2. VERY IMPORTANT.
Added five types of potatoes which extend the potato class, and another
method to the tuber interface, since there are two types of tubers.  Also
fixed a couple spelling errors.