install lazysizes npm package

src/collective/lazysizes/static/lazysizes/CHANGELOG.md

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+# Changelog
+
+## 4.0.0-RC1
+	* make all plugins CommonJS compatible (thx to @claudiobmgrtnr and @jantimon)
+	* added `loadHidden` option(thx to @justinvoelker)
+	* added artdirection plugin (no documentation yet, but great)
+	* iOS 8.1 fixes has to be loaded explicitly in non CommonJS environments (not included in respimg plugin anymore)
+	* removed `picture` support for old FF 38-
+
+## 2.0.0
+
+* lazysizes core:
+	* heavily improved performance (`requestIdleCallback`, better debouncing and a lot more).
+* plugins:
+	* new plugin: [**object fit polyfill**](plugins/object-fit).
+	* improved new options for [parent-fit plugin](plugins/parent-fit).
+
+## 1.5.0
+Breaking change:
+	* the lazysizes.js and lazysizes.min.js files do not register as AMD modules anymore, if you need an AMD module use the new lazysizes-umd.js or lazysizes-umd.min.js file.
+* lazysizes core:
+	* improved lazyloading in background tabs.
+	* fixed set lazyloaded class to early in FF.
+* bgset/parentFit plugin:
+	* improved avoiding layout thrashing.
+* respimg/bgset/parentFit plugin:
+	* fixed bug in Edge 14 to parse height descriptors correctly.
+* unload plugin:
+	unload plugin was broken since version 1.4.0 (thanks to @hokamoto)
+
+## 1.4.0
+* lazysizes core:
+	* improved lazyloading in background tabs.
+	* improved avoiding layout thrashing
+	* support of SVG elements (`svg`/`image`/`use`...)
+* bgset/parentFit plugin:
+	* improved avoiding layout thrashing
+* rias (and bgset):
+	* added support for height calculation (thx to @LRancez, [#213](https://github.com/aFarkas/lazysizes/pull/213))
+
+## 1.3.2
+
+* lazysizes core:
+	* add `hFactor` option (see #181).
+* unload plugin:
+	* simplified `unloadPixelThreshold` calculation.
+* bgset plugin:
+	* add an empty alt to image (see #200).
+
+## 1.3.1 version
+
+* lazysizes core:
+	* replace `setImmediate` with `setTimeout` (improved performance for IE/EDGE).
+* plugins:
+	* fixed conflict with respimg plugin in combination with bgset plugin, in case of art direction and resize to smaller.
+	* fixed conflict with RIaS plugin in combination with respimg plugin/picturefill in Safari 8/9.

src/collective/lazysizes/static/lazysizes/LICENSE

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+The MIT License (MIT)
+
+Copyright (c) 2015 Alexander Farkas
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+