Launch grunt concat task before js tasks

The concat:image_editor grunt task should be executed before the js tasks
reworking search finally
starting on users
more tweaks to search
Merge branch '5.7.0-wip' of github.com:concrete5/concrete5 into 5.7.0-wip
search
more search work
Merge pull request #1507 from mlocati/5.7-grunt-concat-before-js

[5.7] Launch grunt concat task before js tasks