new features in output, manager UI and persister fix
default system.properties
Merge branch 'master' of https://github.com/qcri-social/AIDR
manager code for trashing & taggerPersister .csv download; cosmetic output code modification
aidr-task-manager
Merge branch 'master' of https://github.com/qcri-social/AIDR

Conflicts:
	aidr-manager/src/main/resources/system.properties
	aidr-manager/src/main/webapp/resources/js/taggui/tagger-collection-details/controller/TaggerCollectionDetailsController.js
manager publicly listing & trash code; persister bug fix attempt;
WIP
Merge branch 'master' of https://github.com/qcri-social/AIDR

Conflicts:
	aidr-manager/src/main/resources/system.properties
manager: public & trash; output: balanced sampling; persister: bug fix attempt; task-manager: WIP