Refactored community and collection pages to use a shared component for most of the content. This PR connect’s to #89

Collection home page

Shows the following fields if they exist:
* title
* logo
* introductory text
* news (also referred to as sidebarText)
* copyright text
* license

Fixes https://github.com/DSpace/dspace-angular/issues/63

Full item page

Travis build timeout: this connects to #101

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