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Close #11 - Update code to Swift 3

Closes #11

See merge request !10

Add PUT, PATCH and DELETE methods to the API

__IMPORTANT__: Merge !9 first!

Closes #9

See merge request !7

Destroy a resource item

Closes #6

See merge request !6

List resource items

Closes #5

See merge request !5

Add request methods to Resource

Add request methods to resource:
- Generic request: ```request( method, path? ) {}```
- GET: ```get( path? ) {}```
- POST: ```post( path? ) {}```
- PUT: ```put( path? ) {}```
- DELETE: ```delete( path? ) {}```

Closes #4

See merge request !4

Add nested resources

Add the ability of nest resources in a intuitive way:

```swift
api.resource( "users" ).member( 1 ).resource( "likes" ).list() { likes: [ Like ] in // Do something with the likes }
api.resource( "users" ).member( "me" ).resource( "profile" ).get() { profile: Profile in // Do something }
```

Closes #3

See merge request !3

Create resource item

Add error handling.

Closes #2

See merge request !2

Get a resource item

Get a resource item by an identifier through the API.

Example: Get the item with id 1 from the "items" resource:

```swift
let api = Api( baseURL: <Api URL>, apiPath: "1" )
api.resource( "items" ).item( 1 ) { ( item: Item ) in
   print( "Got item \(item.id)")
}
```
Closes #1

See merge request !1

Add error handling.

Get a resource item by an identifier through the API.

Example: Get the item with id 1 from the "items" resource:

```swift
let api = Api( baseURL: <Api URL>, apiPath: "1" )
api.resource( "items" ).item( 1 ) { ( item: Item ) in
   print( "Got item \(item.id)")
}
```