0.8.0

• updated reference examples to ES6
• updated dev docs to ES6
• fix p5.dom drop() function
• add toggleClass(), hasClass(), addClass() methods to p5.dom
• fix get() method for createCapture()
• fix style() function for positioning
• fix normals for cylinder() and cone()
• fix arc()
• fix handling of keyboard events with multiple sketch instances
• fix for pixel updating
• add p5.Graphics.reset()
• fix for circle() to take diameter instead of radius
• fix for square() to accept corner radius argument
• fix Infinity handling for int(), float(), hex()
• fix texture wrapping
• add image() to webgl mode
• added blendMode() to webgl mode
• add resetShader() method
• add lights() function to webgl mode
• implemented shininess()
• setAttributes() can be called before gl canvas is created