dealing with pubs missing series information better in custom_fiters
Merge remote-tracking branch 'pubs-master/master'

Conflicts:
	pubs_ui/custom_filters.py
removed merge cruft
additional tests for display_pub_info filter
reinforcing of display_pub_info custom filter
more code clean-up
removed print function
added comment to email validation
Merge pull request #83 from ayan-usgs/master

fixes to display_publication_info function and some code clean-up