Merge pull request #66 from aaccomazzi/master

Fix creation of publication dates in SolrAdapter for eprints and thesis
Move date-getter outside of class
Set default provider to u'ADS' for record.text.body and record.text.acknowledgment
Change property field: "NOTREFEREED" --> "NOT REFEREED"
Implement eid; tests updated; set() on alternate_bibcodes; closes #67
Remove pubdate_sort; tests updated; closes #69
Page -> multivalued, [page,eid]; tests updated; closes #68
Add properties.vizier, properties.data_sources; tests updated; update to SolrUpdated next; references #71
Updated schema for links structure, fixed tests
Merge branch 'master' of https://github.com/adsabs/ADSimportpipeline