Add support for Swift 3.0

Tests/StencilTests/VariableSpec.swift

@@ -0,0 +1,77 @@
+import Foundation
+import Spectre
+import Stencil
+
+
+#if os(OSX)
+@objc class Object : NSObject {
+  let title = "Hello World"
+}
+#endif
+
+
+func testVariable() {
+  describe("Variable") {
+    let context = Context(dictionary: [
+      "name": "Kyle",
+      "contacts": ["Katie", "Carlton"],
+      "profiles": [
+        "github": "kylef",
+      ],
+    ])
+
+#if os(OSX)
+    context["object"] = Object()
+#endif
+
+    $0.it("can resolve a string literal with double quotes") {
+      let variable = Variable("\"name\"")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "name"
+    }
+
+    $0.it("can resolve a string literal with single quotes") {
+      let variable = Variable("'name'")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "name"
+    }
+
+    $0.it("can resolve a string variable") {
+      let variable = Variable("name")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "Kyle"
+    }
+
+    $0.it("can resolve an item from a dictionary") {
+      let variable = Variable("profiles.github")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "kylef"
+    }
+
+    $0.it("can resolve an item from an array via it's index") {
+      let variable = Variable("contacts.0")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "Katie"
+    }
+
+    $0.it("can resolve the first item from an array") {
+      let variable = Variable("contacts.first")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "Katie"
+    }
+
+    $0.it("can resolve the last item from an array") {
+      let variable = Variable("contacts.last")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "Carlton"
+    }
+
+#if os(OSX)
+    $0.it("can resolve a value via KVO") {
+      let variable = Variable("object.title")
+      let result = try variable.resolve(context) as? String
+      try expect(result) == "Hello World"
+    }
+#endif
+  }
+}