[NX-429] Use Ext.Direct stores for form fields combos
Merge remote-tracking branch 'origin/master' into NX-429-use-ext-direct-for-combos
Merge remote-tracking branch 'origin/master' into NX-429-use-ext-direct-for-combos
[NX-429] Move ReferenceXO back to core ui plugin
Merge pull request #548 from sonatype/NX-429-use-ext-direct-for-combos

REVIEW: [NX-429] Use Ext.Direct stores for form fields combos