Start working on the caching for the os taxonomy.
Caching the filter by terms plugin.
When node is updated/inserted or create invlidate the cache for taxonomy widget.
Minor change.
Merge branch 'SCHOLAR-3.x' into 5680
Try to invlidate cache after widget update.
Fix #5680 by avoiding caching when block is not rendered properly.
Verify the right behavior selection.
Add test.
Merge branch 'SCHOLAR-3.x' into 5680

Conflicts:
	openscholar/modules/os/modules/os_taxonomy/os_taxonomy.module
Merge pull request #5704 from openscholar/5680

Caching the taxonomy widget.