First draft of API documentation
Move draw module implementation to a separate file
Add missing color.c and event.c files
Rename draw.initdraw() to draw.init()
Move all libdraw event related function to an event module
Fix casing of exported draw constants
Added color module to export color constants to lua
Expose missing Image attributes
Added ellipse() and fillellipse()
Added helper functions to simplify API implementation
Create LICENSE
Update README.md