Bug 171:  List grid view switcher

Using just routerLinkActive doesn't work on first load, the query
parameter might not be defined. Adding 'active' to the class attribute
doesn't work either, it doesn't get removed after switching to the other
view.

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

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

Meta Service

Include all source in test coverage

Added facet/filter methods to the mock search service 

Fixed e2e search page test

Fixed issue with e2e tests after merging

Loading component, Error component and transitions

Simple Search tests