Merge pull request #885 from dennishendriksen/master

Improve shopping cart and REST API error handling
add link from dataexplorer to entityexplorer for xref/mref values
Create link to entityExplorer for xref and mref values
Merge pull request #886 from dennishendriksen/master

First name and last name are not required
support mref links to entityexplorer
fixed hyperlink datatype
moved entityexplorer specific code to omx-dataexplorer module
undo small artifacts of entityexplorer specific code
Merge pull request #887 from bartcharbon/master

DataExplorer link to EntityExplorer for xref and mref values
Merge branch 'master' of https://github.com/molgenis/molgenis
use createAlert and show some spinners