Basic changes for image presenter

[anitagraham]

This PR is a precursor to another one that I have ready to go, but it doesn't fit in the scope of that PR.

Before

'refinery/images/index' can present two different views of the images: list-view and grid-view.
The code to do this was split over several files, and there wasn't much congruence between the code for the two views, though the final markup was not much different.

In the process of implementing a small change to the UI ('click to edit') I have rewritten the index view so that both views use the same code, with a single difference between them.

Now

The image and list views look much the same as they did, with some markup and styling changes.

The markup for the image index is now generated by the same code whether the user has selected List View or Image View.

The appearance of the views has not changed significantly, but the markup/styling to achieve that has.

1. css-grid is used in both index views.
2. In the list view it is used to clearly separate the image title, the locales and the actions. The image file-name sits below the image title in a smaller font.
3. In the list view it allows for simpler markup.

Note 1: Gemfile:
Use refinerycms-wymeditor, branch: master

Note 2:
The images do have 'click to edit'. That is, to edit an image click on any of

1. title (list view)
2. thumbnail (grid view)
3. Language/locale marker (now in grid view as well as list view)
4. The edit icon on the right

Screenshots

[parndt]

is this still needed?

[anitagraham]

No, I don't think so. I'll remove and test again.