A number of new features

- Fixed support for templating (more to come from @nosami on that, and requires a new version of the server).
- omnisharp-helm-find-usages now supports follow-mode properly, with line highlighting. And it's more robust and less code.
- New omnisharp-helm-find-symbols.

Will add some gifs in the future...
 These are indented because they're conditional on helm being installed:
e.g. 
>(when (require 'helm-grep nil 'noerror)
>     (blah))

Happy do unindent them, but the existing indentation is what emacs does by default!