Better bibtex output for conf. series

[aaccomazzi]

As pointed out in this thread: AASJournals/AASTeX60#70 (comment)
we are not doing a great job at creating output for conference series. The two main issues appear to be:

1. No "series" field is created (this may require a new SOLR field)
2. The "booktitle" field seems to be taken from pub_raw

Both of these may be issues with the metadata generation in adspy. Examples:
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2016SPIE.9911E..18A&data_type=BIBTEX
http://adsabs.harvard.edu/cgi-bin/nph-bib_query?bibcode=2013ASPC..475..383A&data_type=BIBTEX

[golnazads]

Editor and series have been added to adspy.
Booktitle is fixed.

[golnazads]

Also make sure series is added to solr.

[golnazads]

added editor and series to bibtex format. as soon as solr has the data it should get populated in the export format.

[golnazads]

implemented in v2.0.29