Globalize is being added back

[ci skip]
Renamed "Finders" to "FinderMethods"
Implemented and documented new Finders addon
Updated docs

[ci skip]
Make History and Finders addons compatible
Bumped version
Lengthen field to allow Postgres tests to pass
Make Active Record a runtime dependency

See #439
Merged changelog from 4.0-stable
Updated Changelog
Bump version
Update homepage and description in gemspec
Merge branch 'master' into globalize

Conflicts:
	lib/friendly_id.rb