Several solr changes [MJ-921]

- Add second collection
- Add fields to schema
- Add/delete from both collections where appropriate
Merge branch 'master' into candidates-mk2
Solr improvements [MJ-921]

- Update dashboard searching to search on company id
- Update fake logs to use dynamic timestamps
- Add task to delete old analytics data from "current" collection
Update comments related to Mock usage [MJ-921]
Merge pull request #695 from DirectEmployers/candidates-mk2

Several solr changes [MJ-921]