constructor and properties added
renamed Base_Invention.cs to Invention.cs
Updated Inventions
added a floor class

the floor class extends gameobject
added a ladder class

ladder extends gameobject
Invention now extends AI

Also created an Image/ directory and Font/ directory in Content/
Please make sure that you add your images and fonts in the correct
directory so we can keep a clean and organized content environment
Added the crude beginnings of a test environment.
Merge remote-tracking branch 'origin/feature/AI' into develop

Conflicts:
	SleepyScientist/SleepyScientist/Base_Invention.cs
Replaced Base_Invention with Invention class.