Bump core and hive jar versions


Bump core and hive jar versions

Bump refinery-core and refinery-hive jars to be 0.0.19 and update symbolic links.
Rename isCrawler function to isSpider.
Add a new agent_type 'bot' for user agents following the 'WikimediaBot' convention.
Enhance spider tagging with better regular expression.
Update pageview definition to exclude preview webrequests using x_analytics header 'preview' tag.

Bug: T108598,T106134,T109383
Change-Id: I65e6e0a6cf1b8522bad4a09e8f9717e827b5cdd8