Citation support via citation.js

[mpasternak]

Hello,

I have quickly hacked citation support via citation.js in the front-end,

here is my branch. Not submitting pull request, because I do have a lot of going on in that branch there.

If any dspace-devs interested in supporting citations in javascript out of the box in the UI, let me know and I will prepare a PR

https://github.com/mpasternak/dspace-angular-wsbnlu/tree/wsbnlu-9.1

[mpasternak]

Here's that citation thingy: https://github.com/mpasternak/dspace-angular-wsbnlu/tree/wsbnlu-9.1/src/app/item-page/citation

[mpasternak]

I'll probably have this version online for demo purposes in this or next week soon.