Reorganize project

[chewisinho]

• Add more directories
• Move logic code out of canvas.js
• Create main.js file
• Clean up and generalize/abstract away code fragments

[pencels]

Reorganization/refactoring progress:

Objects

• Point
• Line Segment
• Polygon
• Triangle
• Angle
• Circle

Properties

• Congruences
• Midpoints

Theorems

• Theorem: base class added; all theorems inherit from it
• Midpoint Splitting Theorem
• Reflexive Property
• SSS Postulate
• SAS Postulate
• ASA Postulate
• Transitive Property
• Vertical Angle Congruence

Interface files

• canvas.js → main.js: the original .js appears to just set everything up
• tabs.js → GUI.js + logic.js: the original .js mixes the meat of the logic and manipulating the GUI; should be split
• Save.js
• checkdialog.js → [we'll be directly clicking on the objects to select them (maybe use jQuery API until that point)]