Allow styles to be loaded from the CSL styles repo

[rmzelle]

The Style > Load Style dialog box at http://editor.citationstyles.org/visualEditor/ only allows the user to select a downloaded style. It would be nice if there was a way to select a style directly from the official CSL styles repository, since we usually want users to start from the most recent version of a style.

[adam3smith]

I think we'll just want to try to keep this sufficiently updated instead. The load isn't going to help much, I think.

[nchachereau]

Hello,

may I request an update to the styles? I'm working on a piece for the Blog Zotero Francophone in which I wanted to show an example of editing a style with the Visual Editor, so I'd be very grateful for this.

I wanted to do it myself and submit a pull request, but I can't figure out how to rebuild the generated citations.

[adam3smith]

I'll try, yes. It takes a good bit of set-up to run this successfully, so no worries about the PR.