[issue-49] Don't prefill authors if too many
Merge branch 'develop' into issue-49
[issue-49] Prepare filters to use Ajax
[issue-49] Send Ajax request
[issue-49] Perform Ajax author search
[issue-49] Pass filter name to Ajax request
[issue-49] Change method name to more general
[issue-49] Set preloaded authors limit
[issue-49] Move const out from List Table class
[issue-49] Display info when more results found
[issue-49] Pass previously chosen value to input hidden
[issue-49] Get author by ID with Ajax
[issue-49] Send request to get author by ID
Merge branch 'develop' into issue-49
Fixing syntax issues caught by jshint
Changing const placement and name
Merge pull request #236 from x-team/issue-49

Issue 49: AJAX loading for user filter in list table