Add set_size arguments.
Create scale method.
Create skelton of AbstractImageReader.
Create Phantom::SVG::Parser::PNGReader.
Add default arguments to Phantom::SVG::Base::set_size.
Create Phantom::SVG::Parser::PNGWriter.
Remove trush.
Optimized code.
Debug for stretch image.
Create Phantom::SVG::Parser::JPEGReader.
Add new spec for jpeg test.
Create skelton of Phantom::SVG::Parser::GIFReader.
Add new spec for gif test.
Update spec file.
add RMagick, start adding gif reader support
animation gif -> animation svg
Merge pull request #11 from Genshin/refactoring

Refactoring