Merged FAD-3148 into 2.x

* FAD-3148 basic non-functioning base class

* FAD-3148 a bit more functionality in the base class

* FAD-3148 added custom promise class and custom response class. Did good things to SparkPost class

* Updated Transmission.php for new refactor, still WIP. Created Resource.php as a parent class for all future resources.

* Removed test functions

* Cleaned up Transmissions.php according to PSR-2, deleted more test code and comments.

* added sync and aysnc, cleaned up code

* added support for async/sync option

* added support for async/sync option

* Added interns to authors

* simplified the request function

* added comments

* added user agent

* added comments in SparkPostPromise

* added comments in SparkPostException

* added comments in SparkPostResponse

* cleaning up test

* updated composer.json and contributing files for testing

* Ran php-cs-fixer

* testing for sparkpost response class

* updated to newer version of guzzle

* updated to newer version of guzzle

* Cleaned up getUrl and other functions

* cleaned up constructor and overrode getCode with getResponse()->getStatusCode()

* fixed up then method

* cleaned up getBody

* deleted old test

* Wrote total coverage tests for SparkPost class

* commented out setting up transmissions endpoint until merging with FAD-3146

1 files changed, 105 insertions, 0 deletions

diff --git a/lib/SparkPost/SparkPostResponse.php b/lib/SparkPost/SparkPostResponse.php
new file mode 100644
index 0000000..9104b33
--- /dev/null
+++ b/lib/SparkPost/SparkPostResponse.php
@@ -0,0 +1,105 @@
+<?php
+
+namespace SparkPost;
+
+use Psr\Http\Message\ResponseInterface as ResponseInterface;
+use Psr\Http\Message\StreamInterface as StreamInterface;
+
+class SparkPostResponse implements ResponseInterface
+{
+    /**
+     * ResponseInterface to be wrapped by SparkPostResponse.
+     */
+    private $response;
+
+    /**
+     * set the response to be wrapped.
+     *
+     * @param ResponseInterface $response
+     */
+    public function __construct(ResponseInterface $response)
+    {
+        $this->response = $response;
+    }
+
+    /**
+     * Returns the body.
+     *
+     * @return array $body - the json decoded body from the http response
+     */
+    public function getBody()
+    {
+        $body = $this->response->getBody();
+        $body_string = $body->__toString();
+
+        $json = json_decode($body_string, true);
+
+        return $json;    
+    }
+
+    // pass these down to the response given in the constructor
+    public function getProtocolVersion()
+    {
+        return $this->response->getProtocolVersion();
+    }
+
+    public function withProtocolVersion($version)
+    {
+        return $this->response->withProtocolVersion($version);
+    }
+
+    public function getHeaders()
+    {
+        return $this->response->getHeaders();
+    }
+
+    public function hasHeader($name)
+    {
+        return $this->response->hasHeader($name);
+    }
+
+    public function getHeader($name)
+    {
+        return $this->response->getHeader($name);
+    }
+
+    public function getHeaderLine($name)
+    {
+        return $this->response->getHeaderLine($name);
+    }
+
+    public function withHeader($name, $value)
+    {
+        return $this->response->withHeader($name, $value);
+    }
+
+    public function withAddedHeader($name, $value)
+    {
+        return $this->response->withAddedHeader($name, $value);
+    }
+
+    public function withoutHeader($name)
+    {
+        return $this->response->withoutHeader($name);
+    }
+
+    public function withBody(StreamInterface $body)
+    {
+        return $this->response->withBody($body);
+    }
+
+    public function getStatusCode()
+    {
+        return $this->response->getStatusCode();
+    }
+
+    public function withStatus($code, $reasonPhrase = '')
+    {
+        return $this->response->withStatus($code, $reasonPhrase);
+    }
+
+    public function getReasonPhrase()
+    {
+        return $this->response->getReasonPhrase();
+    }
+}