Add support for Swift 3.0

Tests/StencilTests/ContextSpec.swift

@@ -0,0 +1,62 @@
+import Spectre
+import Stencil
+
+
+func testContext() {
+  describe("Context") {
+    var context: Context!
+
+    $0.before {
+      context = Context(dictionary: ["name": "Kyle"])
+    }
+
+    $0.it("allows you to get a value via subscripting") {
+      try expect(context["name"] as? String) == "Kyle"
+    }
+
+    $0.it("allows you to set a value via subscripting") {
+      context["name"] = "Katie"
+
+      try expect(context["name"] as? String) == "Katie"
+    }
+
+    $0.it("allows you to remove a value via subscripting") {
+      context["name"] = nil
+
+      try expect(context["name"]).to.beNil()
+    }
+
+    $0.it("allows you to retrieve a value from a parent") {
+      try context.push {
+        try expect(context["name"] as? String) == "Kyle"
+      }
+    }
+
+    $0.it("allows you to override a parent's value") {
+      try context.push {
+        context["name"] = "Katie"
+        try expect(context["name"] as? String) == "Katie"
+      }
+    }
+
+    $0.it("allows you to pop to restore previous state") {
+      context.push {
+        context["name"] = "Katie"
+      }
+
+      try expect(context["name"] as? String) == "Kyle"
+    }
+
+    $0.it("allows you to push a dictionary and run a closure then restoring previous state") {
+      var didRun = false
+
+      try context.push(dictionary: ["name": "Katie"]) {
+        didRun = true
+        try expect(context["name"] as? String) == "Katie"
+      }
+
+      try expect(didRun).to.beTrue()
+      try expect(context["name"] as? String) == "Kyle"
+    }
+  }
+}