Adds base api support via single-inheritance interfaces

Before this change, apis that follow patterns across a service could
only be modeled by copy/paste/find/replace. Especially with a large
count, this is monotonous and error prone.

This change introduces support for base apis via single-inheritance
interfaces. Users ensure their target interface bind any type variables
and as a result have little effort to create boilerplate apis.

Ex.

```java
@headers("Accept: application/json")
interface BaseApi<V> {

  @RequestLine("GET /api/{key}")
  V get(@param("key") String);

  @RequestLine("GET /api")
  List<V> list();

  @headers("Content-Type: application/json")
  @RequestLine("PUT /api/{key}")
  void put(@param("key") String, V value);
}

interface FooApi extends BaseApi<Foo> { }

interface BarApi extends BaseApi<Bar> { }
```

closes OpenFeign#133

bump changelog

bump changelog

Fix regex support when there are multiple @path regexes

Fix an issue with trailing slashes in @path annotations on classes

Adds deflate encoding support

Allows customized request construction by exposing Request.create()

Users may wish to override percent encoding of query parameters.

closes OpenFeign#227

Correct time decoding in RetryAfterDecoder

currentTimeNanos was not returning nanos.

RibbonClient use replaceFirst to remove host rather than other parts …

…of the uri.

refactor RibbonClient to clean url in static method

fixes OpenFeigngh-221

Move to 2.2.9 for travisci release