Add svgo worker and support for svg files.
Load Svgo worker.
Use correct MIME type for SVG.
Run order override not needed.
Merge branch '27-add-svgo-worker' into svg
same fenced code block symbol
also svg in an example
put svgo in accents
put svgo require on separate line
test.svg
travis: npm install -g svgo
need image_size 1.2.0
Merge branch 'svg'