Fixed raw blob retrieval

Author: morozov

lib/Github/Api/GitData/Blobs.php

@@ -15,7 +15,7 @@ public function configure($bodyType = null)
     {
         if ('raw' == $bodyType) {
             $this->client->setHeaders(array(
-                sprintf('Accept: application/vnd.github.%s.raw', $this->client->getOption('api_version'))
+                'Accept' => sprintf('application/vnd.github.%s.raw', $this->client->getOption('api_version'))
             ));
         }
     }

test/Github/Tests/Functional/RepoTest.php

@@ -24,6 +24,24 @@ public function shouldShowPRDiffIfHeaderIsPresent()
         $this->assertTrue('string' === gettype($diff));
     }
 
+    /**
+     * @test
+     */
+    public function shouldRetrieveRawBlob()
+    {
+        $api = $this->client->api('git_data')->blobs();
+        $api->configure('raw');
+
+        $contents = $api->show(
+            'KnpLabs',
+            'php-github-api',
+            'e50d5e946385cff052636e2f09f36b03d1c368f4'
+        );
+
+        $this->assertInternalType('string', $contents);
+        $this->assertStringStartsWith('<?php', $contents);
+    }
+
     /**
      * @test
      */