+ImageExtensions blank static class
+AddLine method to draw a line on an image
Updating line drawing code to now use the helper
-Graphics instance from the form (in helper now)
Merge pull request #3 from alexwnovak/feature/refactor

Feature/refactor
+Tools menu
+Pen menu item with shortcut
+Rectangle menu item
+Blank handlers for Pen and Rectangle
+Blank ToolType enum
Values for Pen and Rectangle
+ToolType property that dictates which tool we're using

Updates the Tool menu's item as to which is checked.
Only drawing lines on Pen tool
Tracks the rectangle you drag out with the Rectangle tool
Draws a rectangle when you let up after dragging
Moving rectangle stuff to jive with new framework