Supporting non-standard Markdown Previewer CSS

[veltall]

Issue

I use markdown-preview-plus for its excellent MathJax support (using the mathjax-wrapper to expose Atom's LaTeX library). This previewer cannot be used in conjunction with the Atom-provided markdown-preview package, so one has to be disabled for the other to be usable.

Request

Failing an official resolution, I would appreciate any guidance in solving this issue just for my personal use. I can imagine two breakpoints:

1. The prepending CSS cannot be pulled from markdown-preview
2. marked does not support Mathjax

Thanks for the awesome work and any help.

[travs]

What error(s) are you getting? Those breakpoints seem reasonable, and 1 would be easy to fix while 2 would be a little more difficult.

[travs]

@veltall Anything ever happen to this on your end?

[travs]

Going to call this fixed due to merge of #88