220 support negative facets

[kghmanuel]

Fixes #220

1. set of changes to support negated facets
2. requires updated ml-search-ng, drop the custom ml-search-ng.js being used.
3. update versions of bower libraries.

Concerns:
ng-ckeditor#0.2.1 depends on angular#~1.2.9 which resolved to angular#1.2.32
ng-json-explorer#f7236fa857 depends on angular#~1.2.20 which resolved to angular#1.2.32

violation/incompatibility already existed prior to this change.
angular js version 1.5.8 chosen due to: angular-ui/ui-router#2889

[grtjn]

I think we can drop this comment..

[kghmanuel]

deng... missed that one. will adjust

[grtjn]

Thanks very much, this looks very promising!

I like the idea of finally dropping that local copy of ml-search-ng.js a lot.

I also like the idea of upgrading to latest angular-bootstrap. But I think you need to go over the html files to check for usage of things like (uib-)typehead, (uib-)tabset, etc. I don't recall how much we use from ui-bootstrap, but typeahead at the least. Please check against the directives listed at https://angular-ui.github.io/bootstrap/

I also think it is reasonably safe to ignore the angular dependency json-explorer. Less sure about the editor, but you could consider migrating to the editor we use in slush. Should be a relatively minor change, and pretty easy to check. By the way, don't recall where we use json-explorer. Are we actually using it somewhere?

[kghmanuel]

As discussed in pull request #280, this would have to be further adjusted to have the tracked negative facets cleared on "clear()"

[kghmanuel]

I have also reviewed the migration list: https://github.com/angular-ui/bootstrap/wiki/Migration-guide-for-prefixes. So far only the modal and modalInstance were actual hits in the previous code.

Lastly, i think migrating the rest of the items like editor should be done on a separate pull request if possible. Also not sure about json-explorer. Just reporting the warnings that gulp is telling me and that it exists prior to this pull request.