61947: atarix83 feedback changes 19-04-2019

configurable_entities merged with master

Conflicts:
	src/app/+item-page/item-page.module.ts
	src/app/+search-page/search-filters/search-filter/search-filter.service.ts
	src/app/+search-page/search-page.component.ts
	src/app/+search-page/search-page.module.ts
	src/app/core/shared/dspace-object.model.ts
	src/app/core/shared/item.model.ts
	src/app/core/shared/metadata.models.ts
	src/app/core/shared/resource-type.ts
	src/app/shared/services/route.service.spec.ts
	src/app/shared/services/route.service.ts
	src/app/thumbnail/thumbnail.component.html

Submission implementation

Search performance optimisations

Home pagination issue fix

# Conflicts:
#	yarn.lock

Conflicts:
	yarn.lock

Bootstrap upgrade to 4.3.1

Conflicts:
	src/app/core/data/request.service.spec.ts
	src/app/core/data/request.service.ts