Fix #1325 Select2 select control not showing images on low resolutions
default ajax config: show/hide spinner and display error alerts
fix unbind event listener issue
Merge pull request #1326 from dennishendriksen/master

Fix #1325 + default ajax config: show/hide spinner and display error alerts
Merge branch 'master' of https://github.com/molgenis/molgenis

Conflicts:
	molgenis-omx-dataexplorer/src/main/resources/js/dataexplorer-aggregates.js
Fix merge