Merge branch 'master' of https://github.com/kellyegan/sketch3d
Using simpleOpenNI 1.9.6
Change default brush color to white.
Stopped drawing the secondary hand. Drawing hand cursor now same size as brush.
Cleaned up lines from keyboard input.

Removed some printlns , unused code
Added getter for handedness in Skeleton class
renamed file
Added preference menu gui elements
Added changingPreferences boolean
Tweak preference menu position.
Now can choose file name for export
Added menuState for changing menus

Switch from a list of booleans to a menu state feature
Increased font size changed to Helvetica
Turns off file menu after action.
Added help menu.
Populated help menu with items.
Merge branch 'pref-menu'
Added file extension to user chosen filename.

This is pretty dumb. Could check if the extension is already set but it
works. Removed some extraneous stuff.
Made DXF export easier for import into Blender

Scales, rotates and translates model to be centered in Blender upon
import.
Added background rendering to PDF export