Public facing feature requests

• ability to render against multiple targets (gpu/cpu)
• versioning (which version of skia was this run against)
• magnifying glass (both client side and server side)
• specify scale, rotate, clip (possibly animating over a range)
• change canvas size from 300x300 to other sizes

Implementation details

• Add flag for inout directory to webtry.go.
• In webtry.go add mutexes per hash, to avoid conflicts of writing the same file at the same time.
• Add font support in the c++ template.
• Add inline links to doxygen.
• Add monitoring and probing (nagios).