Merge Commentaries/wip-jorran

Merge conflict fixed in `theses_detail`,
 due to a hotfix in commit `4d42a5d8`.

To avoid merging problems with useless files,
 merge the .gitignore file first.

The dependencies list `package.json` was not included in
 repository, due to a mistake in the gitignore.

I made a mistake by starting `go_responsive` from
 the `master` branch. However, I still want to first
 push it to `development`.

 Conflicts:
	.gitignore
	commentaries/views.py
	submissions/models.py
	theses/views.py

Alter the screen width values to get closer to
 the original SciPost design.

Login page is now responsive with the
 use of a template filter, such that all
 forms from now on may easily be printed
 using the same html frame. See `bootstrap`
 templatetag.

The styling of the homepage is back to the styling of the `master`
 branch, but responsive. Needs detailed styling edits for i.e.
 the mobile menu.

Last commit was incomplete as the
 gitignore was not suffiently working on
 all static files.
It now includes the renewed template files
 to make the homepage reponsive. Also, it
 completes the configuration for Bootstrap
 Webpack loader.

Update and configure to Webpack@2.x
 and install Bootstrap@4.0.0@beta-6
 loader. Configured to start using
 .scss files.

The `static` folder will be ignored in the future commits. All
 existing files in this folder in the repository are now removed.

The README.md file is updated to include a correct workflow
 on how to deal with static files.

Added a NPM packages.json list which manages
 JavaScript packages. Most important packages added
 is the Webpack package which acts as an assets
 bundler.
It is added in its most basic working form. This
 includes additional settings in `settings.py`
 and the template tags in `base.html`.
Please read the updated Readme.md to easily get
 started using Webpack for your new assets.

Add test to check expected ValueError
on processing form before validation.

Add more VetCommentary tests for the
three different possible valid form actions.

Add valid test for accepted `VetCommentaryForm`.
Further added factory for unvetted Commentary.