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Flatten and expand golang maps and structs

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# bellows
Flatten and expand golang maps and structs

## Features
There are some existing golang flatten/expand implementations, but they are targeted to specific use-cases, and none of them flatten Structs.  This one doesn't do Slices, but the feature could be added.

This `Flatten` will skip parsing a Map that does not have a String as the index.

This `Flatten` recursively passes values as their original Interface, so it is simpler than implementations that rely on passing reflect.Value.

## Usage

```go
// Expand a dot-separated flat map into a nested map
func Expand(value map[string]interface{}) map[string]interface{} {}

// Expand a dot-separated flat map into a nested map, with a prefix
func ExpandPrefixed(value map[string]interface{}, prefix string) map[string]interface{} {}

// Expand a dot-separated flat map into an existing nested map, with a prefix
func ExpandPrefixedToResult(value map[string]interface{}, prefix string, result map[string]interface{}) {}

// Flatten a nested map into a dot-separated flat map
func Flatten(value interface{}) map[string]interface{} {}

// Flatten a nested map into a dot-separated flat map, with a prefix
func FlattenPrefixed(value interface{}, prefix string) map[string]interface{} {}

// Flatten a nested map into an existing dot-separated flat map, with a prefix
func FlattenPrefixedToResult(value interface{}, prefix string, m map[string]interface{}) {}
```

## Examples

Used in [an update to Viper](https://github.com/doublerebel/viper), to normalize config values coming from nested (JSON) and flat (CLI flags, env vars) sources.

## Other golang flatten/expand implementations

* [hashicorp/terraform/flatmap](https://github.com/hashicorp/terraform/tree/master/flatmap)
  * [turtlemonvh/mapmap](https://github.com/turtlemonvh/mapmap)
  * [peking2/func-go](https://github.com/peking2/func-go)
  * [wolfeidau/unflatten](https://github.com/wolfeidau/unflatten)
  * [jeremywohl/flatten](https://github.com/jeremywohl/flatten)

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