Add support for Swift 3.0

Tests/StencilTests/NowNodeSpec.swift

@@ -0,0 +1,43 @@
+import Foundation
+import Spectre
+import Stencil
+
+
+func testNowNode() {
+#if !os(Linux)
+  describe("NowNode") {
+    $0.describe("parsing") {
+      $0.it("parses default format without any now arguments") {
+        let tokens: [Token] = [ .block(value: "now") ]
+        let parser = TokenParser(tokens: tokens, namespace: Namespace())
+
+        let nodes = try parser.parse()
+        let node = nodes.first as? NowNode
+        try expect(nodes.count) == 1
+        try expect(node?.format.variable) == "\"yyyy-MM-dd 'at' HH:mm\""
+      }
+
+      $0.it("parses now with a format") {
+        let tokens: [Token] = [ .block(value: "now \"HH:mm\"") ]
+        let parser = TokenParser(tokens: tokens, namespace: Namespace())
+        let nodes = try parser.parse()
+        let node = nodes.first as? NowNode
+        try expect(nodes.count) == 1
+        try expect(node?.format.variable) == "\"HH:mm\""
+      }
+    }
+
+    $0.describe("rendering") {
+      $0.it("renders the date") {
+        let node = NowNode(format: Variable("\"yyyy-MM-dd\""))
+
+        let formatter = DateFormatter()
+        formatter.dateFormat = "yyyy-MM-dd"
+        let date = formatter.string(from: NSDate() as Date)
+
+        try expect(try node.render(Context())) == date
+      }
+    }
+  }
+#endif
+}