Add support for Swift 3.0

Tests/StencilTests/InheritenceSpec.swift

@@ -0,0 +1,17 @@
+import Spectre
+import Stencil
+import PathKit
+
+
+func testInheritence() {
+  describe("Inheritence") {
+    let path = Path(#file) + ".." + "fixtures"
+    let loader = TemplateLoader(paths: [path])
+
+    $0.it("can inherit from another template") {
+      let context = Context(dictionary: ["loader": loader])
+      let template = loader.loadTemplate("child.html")
+      try expect(try template?.render(context)) == "Header\nChild"
+    }
+  }
+}