Lunasvg

- Fix Path points overflow 55
- Fix parseStyle 101

- Fix opacity calculation
- Add matrix methods
- Fix parsing error 68
- Change Bitmap format RGBA Plain -> ARGB Premultiplied 73
- Support SVG 2.0 href (fdwr)
- Support quoted URL value
- Set stop::offset default = 0 (fdwr)

- Fix recursive `path` parsing 62

- Change document.h to lunasvg.h 56
- Add documentations

Support

- CSS pseudo-classes
* not
* root
* first-child
* last-child
* first-of-type
* last-of-type

- fallback color
- `overflow`
- XML entities
- CSS comments
- `mask` region

Fix

- `viewBox` transformation
- Recursive `use`, `clipPath`, `mask`, `marker` and `pattern` referencing
- Optimize compositing

Enjoy!!!

- Support CSS important
- Fix recursive stylesheet
- Fix selector precedence