gh-pages: add .nojekyll option

[jescalan]

There should be an option to add this file, if you don't, any directory starting with an underscore is processed differently.

https://github.com/blog/572-bypassing-jekyll-on-github-pages

[notslang]

default to not adding the file?

[kylemac]

yeah default to not adding the file. I think that would be what @Jenius's intentions were

[notslang]

that makes sense, so long as we're focusing on "generic deployment" (which could include jekyll sites), rather than just standard website deployment.

[jescalan]

Yup