Add possibility to check rollout without instantiate the model

#35

Minor fix

#34 - Bug-fix - Not possible to call FeatureFlagger.configure more than once;

Release feature to all

An easy way to release a new feature to all objects with one single command.

# Releasing a feature to all accounts
Account.release_to_all(:email_marketing, :new_email_flow)

# Unreleasing a feature to all accounts
Account.unrelease_to_all(:email_marketing, :new_email_flow)

# Unreleasing a feature to all accounts (and remove all set ids)
Account.unrelease_to_all!(:email_marketing, :new_email_flow)

This is very useful when you want to release a new feature to all accounts without a deploy or doing a foreach. And rollbacking the release if necessary.

Bug fix: Model.all_released_ids_for referencing legacy code

Thanks to @leonardorisch this is solved now.

PR: #23

"!" methods deprecations and refactors

v0.6.0

bump version 0.6.0

Better feature check syntax

v0.5.0

bump version 0.5.0

Refactorings

v0.4.0

bump version

Uncouple redis storage

This release uncouples the redis storage allowing the use of custom storages by implementing corresponding class.

Adds `Model.all_released_by_ids`

v0.2.0

bump version

Initial Release

v0.1.0

adds license