Update installation instructions on emacs.

[razzmatazz]

This updates installation instructions a bit to match the new roslyn version of omnisharp-emacs.

Part of OmniSharp/omnisharp-emacs#333

Also, could someone comment if index.md is still used? I could not find a way to get there with jekyll serve (nor on the main ste on http://www.omnisharp.net/)

[peterblazejewicz]

Also, could someone comment if index.md is still used? I could not find a way to get there with jekyll serve (nor on the main ste on http://www.omnisharp.net/)

This is the source of the page:
https://github.com/OmniSharp/OmniSharp.github.io/blob/master/_layouts/default.html
Listed includes are rendered. The 'index.md' is used by defult configuration - but is treated more as a guide, as the liquid code does not have this tag so no content is rendered when page is generated :) (fact of live, not my code):

{{ content }}

[razzmatazz]

@peterblazejewicz so can this PR go as is or do I still need to massage it a bit? :)

[peterblazejewicz]

Yes, it looks good (I cannot do merges to this repo though):

[peterblazejewicz]

The expected output information is rendered OK

[kirkins]

I always get omnisharp: OmniSharp server terminated when I try starting the server.