Add member: Always return 409 when a member exists

See merge request !1215

Port of "clean-javascript-vendor-files" to EE

See merge request !1223

Squashed commit of the following:
    convert js-cookie dependency to an npm module
    convert timeago.js dependency to an npm module
    remove vue from vendor since it is now in node_modules

Fix bundle tag in anaytics page

See merge request !1222

Hide squash checkbox when there is a single commit

Closes #1697

See merge request !1213

When there is only one commit, the squash checkbox doesn't do
anything. When a commit is added after the widget is loaded, the MR
can't be merged anyway - you have to refresh the page. So we can only
show the checkbox on page load if there's more than one commit.

Re-add removed params from projects and issues V3 API

Closes #1698

See merge request !1209

Update MergeRequest API state_event option documentation

See merge request !1205

Port of revert-0ef587b6 to EE

See merge request !1204

Port "Upgrade to webpack v2.2.1" to EE

See merge request !1203

EE: Don't perform Devise trackable updates on blocked User records

See merge request !1145

Port "Upgrade from Babel 5 to Babel 6" to EE

See merge request !1202

Add weight to chat messages

See merge request !1172

CE upstream

See merge request !1201

Squashed commit of the following:

    approve new dependencies
    update karma deps to work with webpack 2
    upgrade to webpack 2.2.x

squashed commit of the following:

    update dependency approval reason
    approve MIT license for wordwrap submodule
    fix failing karma test
    upgrade babel to v6
    exclude node_modules from imports-loader wrapper

Port of 27610-issue-number-alignment to EE

Closes gitlab-ce#27610

See merge request !1198

Refactored diff notes Vue app

See merge request !1199

Replaced images with the updates UX. Solving #23173

See merge request !8941

Update git clone docs

See merge request !8946

CE Upstream - Wednesday

See merge request !1191

Update Prometheus documentation

See merge request !1200

Update Prometheus documentation

Closes #27735

See merge request !9060

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Reported in https://gitlab.com/gitlab-org/omnibus-gitlab/issues/1905

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