Updates for compatibility with latest flipper adapter api.
Move redis to gemspec.
Rspec fail fast.
Adapter now only does one redis call per get of a feature.

Using a redis hash that looks something like this.

key:stats field:boolean             value:true
key:stats field:groups/admin        value:1
key:stats field:groups/early_access value:1
key:stats field:actors/1234         value:1
Lock gemfile to latest flipper master.