Red
===

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Store relations between entities using [redis](http://redis.io).

## Example: A `follow` system

```elixir
import Red

# @vcr2 -{follow}-> @hex_pm

{:ok, _} =
  "@vcr2"
  |> relation(:follow)
  |> add!("@hex_pm")

"@vcr2" |> relation(:follow) |> Enum.at(0)
> "@hex_pm"

# @vcr2 ===follow===> *
count_following = "@vcr2" |> relation(:follow) |> Enum.count
> 100

# @vcr2 <===follow=== *
count_followers = "@vcr2" |> relation(:follow, :in) |> Enum.count
> 43

# jump 10, next 5
"@vcr2" |> relation(:follow) |> offset(10) |> limit(5) |> Enum.to_list
> []
```