Adds support for append html attributes

[joaovitoras]

Inspired by ruby inline_svg my intention is to make possible add html attributes in the svg found and allow it to be possible to make other modifications to the svg

• Changes docs to ExDoc styles
  • Fixes html svg syntax hightlighting
• Adds support for options in svg_image function
• Makes id and class available options

Todo:

• Tests

WIP

[coveralls]

Coverage remained the same at 0.0% when pulling 3cf98f8 on quero-edu:adds-support-for-append-html-attributes into 22b46e2 on nikkomiu:master.

[nikkomiu]

Why did you remove the markdown syntax for the code blocks from the docs?

[joaovitoras]

I've changed the default way of blocking syntax from ExDoc code. It supports markdown syntax but for elixir code it already identifies by default, I just made explicit the ones that really need like html in the svg block.
Do you prefer to make everything explicit? I can reverse it if it's better.

[nikkomiu]

Awesome, I didn't realize there was an implicit for Elixir.

[nikkomiu]

v1.1.2