[18714] Pin select2 3.5.2 [Backport to 4.2]

[myabc]

Backports #3120 changes to release/4.2

This will pin the dependency to select2 to 3.5.2

I noticed it while doing a quick reinstall of all the node_modules and bower deps.

[TeatroIO]

I've prepared a stage to preview changes. Open stage or view logs.

[myabc]

@ulferts @NobodysNightmare as @floriank mentioned in #3120, this should go into release/4.2, release/4.3 and feature/rails4. bower install behaviour differs depending on whether there is an existing bower_components directory. In the case of our Rails 4 QA instances, set-up from scratch, the wrong version of select2 has been installed - causing quite a few UI issues (and I'm assuming, blocking proper review of the feature/rails4 branch).

[floriank]

After a quick checkout this should be okay to merge, let's wait for travis.