DATASOLR-99 - Define field name via Indexed annotation

In addition to o.a.s.c.solrj.beans.Field, properties can be annotated
with org.springframework.data.solr.core.mapping.Indexed.
Upcoming features will be built upon Indexed annotation. Unfortunately
the annotation had to be moved from o.s.d.s.repository to
o.s.d.s.c.mapping as it had been created in the wrong location in first
place.
DATASOLR-106 - Upgrade to Solr 4.5.1