[OpenGLRenderer] Rough outline of an NSOpenGLView subclass

Handles setting up the displayLink and starting it when added/removed from a
superview. It is up to subclasses (or delegates -- I haven't decided which yet)
to add the appropriate behavior.

OpenGLRenderer/OpenGLRendererTests/OpenGLRendererTests.swift

@@ -0,0 +1,36 @@
+//
+//  OpenGLRendererTests.swift
+//  OpenGLRendererTests
+//
+//  Created by Eryn Wells on 11/12/15.
+//  Copyright © 2015 Eryn Wells. All rights reserved.
+//
+
+import XCTest
+@testable import OpenGLRenderer
+
+class OpenGLRendererTests: XCTestCase {
+    
+    override func setUp() {
+        super.setUp()
+        // Put setup code here. This method is called before the invocation of each test method in the class.
+    }
+    
+    override func tearDown() {
+        // Put teardown code here. This method is called after the invocation of each test method in the class.
+        super.tearDown()
+    }
+    
+    func testExample() {
+        // This is an example of a functional test case.
+        // Use XCTAssert and related functions to verify your tests produce the correct results.
+    }
+    
+    func testPerformanceExample() {
+        // This is an example of a performance test case.
+        self.measureBlock {
+            // Put the code you want to measure the time of here.
+        }
+    }
+    
+}