Use anchor tags with href for navigation

[larkin]

We should use standard browser navigation via anchor tags with href attributes instead of ng-click directives that tie directly into the navigation service.

This allows us to reuse standard anchor styles (cursor changes, etc), and is more in line with how browser navigation works on the open internet.

[VWoeltjen]

Moving comment over from #289:

We could remove navigation as a concern from the information model and just handle it in the display layer (e.g. as links); I agree this would be much more in line with normal functionality. This makes initiating these interactions in other ways a little difficult however (e.g. navigating to an object upon its creation), and runs a risk of becoming inflexible (reusing that code on the backend, for instance.) Think we'd end up wanting to express these changes as actions anyway for that purpose; possibly add an optional url property to actions allowing the display layer to represent these as simple links (in lieu of invoking perform)?

[larkin]

Navigation isn't a back-end concern, not even sure what navigating means in that context.

Left a comment in #69 for more discussion.