Added language_term_text and language_term_code fields to ModsDocument terminology
MODS date extraction features for start dates, end dates and single point dates
Update to MODS language extraction code (added authority attribute); Update to recursive indexer, allowing omission of specific pids
Added lib_start_date_year_sim and lib_end_date_year_sim for holding only the year from start and end dates
lib_start_date_year and lib_start_date_year should be integer fields instead of string fields
More date-related MODS/indexing updates
start_date_year and end_date_year indexing changes
Now handling date years that are fewer than four characters long
Updated recursive indexing task; Also indexing start and end years as date fields
Indexing dates as TrieInt fields now for better range queries
...and using TrieInt instead of Date field because Solr can't handle negative dates as of this writing
See: https://issues.apache.org/jira/browse/SOLR-2773
and: https://issues.apache.org/jira/browse/SOLR-1899
Now indexing subject topics and subject geographics
Merge pull request #8 from elo2112/master

Mostly indexing updates