For now it allows to switch between list and grid views.

Fixes https://github.com/DSpace/dspace-angular/issues/171

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

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