Lazy load images with the light lib bLazy.js instead of jQuery

[ArthurHoaro]

• Remove jquery.lazyload lib
• Add blazy lib
• Add a bit of CSS animation
• Delete unused picwall2 template

[nodiscc]

👍

[e2jk]

• Please include the non-minified version of the library. We want to have the source included, not just the "compiled/binary" form.
• Please update the COPYING file to:
  • mention the copyright of this library. (According to https://github.com/dinbror/blazy/ it's MIT licensed)
  • remove mention of jquery-lazyload
  • (tip: as both libraries are similarly licensed, you can just update that line to refer to the new library instead)

Not blocking for this Pull Request, but please in the future submit separate PRs for separate changes (in this example, 3 PRs would have been nice: libraries, CSS, picwall2.html). This makes merging and discussing easier, for example if the library switch would have been controversial (which I don't think it is), you can at least already have the 2 other changes merged while the discussion on the 3rd continues.

[ArthurHoaro]

It's done.

About separate commits, I understand you're point, but picwall2.html wouldn't work without the lib, and the CSS wouldn't apply without the template. I'm not sure it would be really pertinent in this particular PR.

[pikzen]

Note: this actually nukes all of jQuery and removes this dependency from Shaarli.
This also means that we need to remove the "Disable jQuery" option if this gets merged, or maybe replace it with "Disable JS"? This would break half of Shaarli, and we probably need to take a look at how it is implemented.

Otherwise this PR is fine.

[ArthurHoaro]

No it doesn't. I just removed lazy loading jQuery plug-in.

[nodiscc]

@pikzen jQuery is still used for tag autocompletion/suggestion. We started discussion about removing it/using another autocompletion system in #49

[nodiscc]

Tested and works perfectly, thanks. I'll merge it tomorrow if nobody disagrees.