Promote geoip and useragent filters to milestone 3

These filters both have tests and have been around for a while. GOOD JOB
FILTERS!
Merge 1.4.0 beta + rc changelog into 1.4.0 changelog
Merge pull request #1178 from jordansissel/prep-1.4.0-GA

Prepare 1.4.0 GA
Merge branch 'master' into 1.4.x