Allow branch/ref to be passed into url
Allow branch/ref to be passed into url

- Split on '=' but also include the second pair if it exists
- Allows passing in of files that are on a specific branch e.g. https://api.github.com/repos.json?ref=some-branch

Wynndow/wynndow.github.io,dxw/fourth-wall-for-gitlab,dxw/fourth-wall-for-gitlab,Wynndow/wynndow.github.io,Wynndow/wynndow.github.io,HolyHaddock/fourth-wall,dxw/fourth-wall-for-gitlab,alphagov/fourth-wall,alphagov/fourth-wall,HolyHaddock/fourth-wall,HolyHaddock/fourth-wall,alphagov/fourth-wall