ie

```
defenum(Color, :color, [:red, :green])
Color.red() => :red
```

…stants

This macro in the patch allows for using these enums inside the codebase
to represent the same value, instead of needing to redefine them :)

Thus:

```
defenum(Status, :status, [:good, :bad, :other])
Status.good() => :good
```

Previously dashes in the atom would break the function definition and
make it non-standard Elixir (ie we need valid atoms for function names).

Make getters macros for pattern matching power