[super] Data Previewer / Viewer v2

[rgrp]

We already have first pass of Data Preview that was done as part of #1357. This is about v2 of this. Two main components:

• A new version of the separate Data Explorer library (now called Recline Data Explorer) - #1446 Est: 10-15d
  • Why:
    • Cleaner, backbone based solution.
    • Provides editing support if wanted.
    • Collaboration with Max Ogden
• Integrate this into CKAN (into resource view page) - see #1630 Est: 1d
• Improvements to Data Viewer / Previewer system in CKAN itself - Est: 2-3d
  • (Update Data Preview-er (View-er) to support images ...)
  • (?) Update Data Preview-er to support geodata - #1151

[rgrp]

Image (pre)viewing done in ​https://github.com/okfn/ckan/commit/2b08425c3aef424d4192838e418b7ad9ccc6a129.