Xponents v3.7 baseline

Xponents 3.7 provides these refinements on tagging:

• filtering noise and abbreviations
• enhanced tag filtering for CJK and Arabic language groups, as well as improved Spanish stopwords
• bare country codes and bare, short administrative codes are omitted, e.g., UK, Uk, or uk is tagged as a country, but filtered out if it is not qualified/preceded by a city or province.

Library cleanup

• Converge geodesy and giscore libraries from opensextant under Xponents, rather than as separate dependencies. Java compatibility concerns, long term.
• Latest Apache Commons and logging libraries updated
• Updated opensextant python support library released at https://github.com/OpenSextant/Xponents/releases/tag/python-v1.5.8

Docker release of Xponents REST API and Gazetteer is here: https://hub.docker.com/r/mubaldino/opensextant . mubaldino/opensextant:xponents-3.5 image is the latest rev. v3.7 of docker image is pending.