Show Works in AmberDB

Hi,

Introduces routes to the WorksController for displaying works: `/works/{id}` and `works/solr/{id}`

The SOLR route is linked to by the SearchController - the SOLR index doesn't link up with AmberDB yet.  It should be removed when solr is solring the amberdb properly.

The `works/{id}` route accepts straight IDs (eg. 22) or PI-type ids (eg. nla.obj-229).

Huw