Update for swift 3.

- Convert code to swift 3
- Update alamofire to 4.0.1 for swift 3.

ShadowsocksX-NGTests/ShadowsocksX_NGTests.swift

@@ -28,7 +28,7 @@ class ShadowsocksX_NGTests: XCTestCase {
     
     func testPerformanceExample() {
         // This is an example of a performance test case.
-        self.measureBlock {
+        self.measure {
             // Put the code you want to measure the time of here.
         }
     }