Add type to mock data

Simple Item Page - Tests & Docs

This merge closes #46 

Replaced row class with custom mixin, as using row to offset gutter widths has side-effects in newer versions of bootstrap

# Conflicts:
#	package.json
#	src/app/app.component.html
#	src/app/app.component.ts
#	src/app/core/cache/request-cache.reducer.spec.ts
#	src/app/core/cache/request-cache.service.spec.ts
#	src/app/core/core.module.ts
#	src/app/shared/shared.module.ts

upgraded to ngx-translate

Initial home page content

Simple Item View Page

Add support for Communities

Rest relationships

Merge branch 'rest-relationships' of https://github.com/artlowel/dspace-angular into w2p-40416_simple-item-page

Conflicts:
	src/app/core/cache/models/normalized-item.model.ts
	src/app/core/shared/item.model.ts