Moving to Github Actions for CI

Uset Redis#hmset to keep compatibility with Redis < 4.0

Upgrade to GitHub-native Dependabot

Fix minor typos in README.md

Caching based optimization in the experiment#save path

Check if experiment is new by catalog

Add Split::Cache to reduce load on Redis

Fix typo of in `Split::Trial` class variable

There is a class variable, `alternative_choosen` in the `Split::Trial`
class. This class variabl...

add a simple way to load users outside web session

Single HSET to update values, instead of multiple ones.

Remove 'set' parsing for alternatives. Sets were used as storage and deprecated on 0.x

Remove Sinatra Dependency for Split Dashboard

Force experiment does not count for metrics

When using the admin dashboard and forcing an experment, this should not count
on metrics and sh...

Adding documentation related to what is stored on cookies.

Removes metadata key when it updated to nil

Simplify RedisInterface usage when persisting Experiment alternatives

Remove redis_url impl. Deprecated on ~2.2

Remove thread_safe config as redis-rb is thread_safe by default since 2.2

Bump minimum required redis to 4.2

Only support Ruby versions >= 2.5

Update Trial so that goals are accessible in callback

Introduce enable/disable experiment cohorting

ab_test must return metadata on error or if split is disabled/excluded user

Removed repeated loading from config

Replace usage of SimpleRandom with RubyStats

Fix #max_experiments_reached? when using allow_multiple_experiments=control

When using allow_multiple_experiments=control Split only allows one
experiment with an alternati...

Add on_winner_choose hook

Update rake requirement from ~> 12 to ~> 13

Updates the requirements on [rake](https://github.com/ruby/rake) to permit the latest version.
-...

Updates the requirements on [rack-test](https://github.com/rack-test/rack-test) to permit the la...

Support only ruby 2.2.2+ / Rails 5.0+

Only block Pinterest bot

Respect experiment defaults when loading experiments in initializer.