Image class:
- enhancement to saveOutput function 
- added encode method to output image as base64 encoded url stream and set it as default __toString string serializer
- added html method
- make getHandle method private
- changed load to autodetect binary string
- fixed some docs
- make more functions chainable
Canvas class:
- some minor tweaks to __call magic method
- make independent from Image class now can be used as pure wrapper to gd library
- added getHandle method