added segments method

Author: AndrewTSeipp

test/IntercomSegmentsTest.php

@@ -0,0 +1,15 @@
+<?php
+
+use Intercom\IntercomSegments;
+
+class IntercomSegmentTest extends PHPUnit_Framework_TestCase {
+
+  public function testSegmentList()
+  {
+    $stub = $this->getMockBuilder('Intercom\IntercomClient')->disableOriginalConstructor()->getMock();
+    $stub->method('get')->willReturn('foo');
+
+    $segments = new IntercomSegments($stub);
+    $this->assertEquals('foo', $segments->getSegments());
+  }
+}