Add Package.swift and move files around

Sources/Include.swift

@@ -0,0 +1,38 @@
+import PathKit
+
+
+public class IncludeNode : NodeType {
+  public let templateName: Variable
+
+  public class func parse(parser: TokenParser, token: Token) throws -> NodeType {
+    let bits = token.components()
+
+    guard bits.count == 2 else {
+      throw TemplateSyntaxError("'include' tag takes one argument, the template file to be included")
+    }
+
+    return IncludeNode(templateName: Variable(bits[1]))
+  }
+
+  public init(templateName: Variable) {
+    self.templateName = templateName
+  }
+
+  public func render(context: Context) throws -> String {
+    guard let loader = context["loader"] as? TemplateLoader else {
+      throw TemplateSyntaxError("Template loader not in context")
+    }
+
+    guard let templateName = try self.templateName.resolve(context) as? String else {
+      throw TemplateSyntaxError("'\(self.templateName)' could not be resolved as a string")
+    }
+
+    guard let template = loader.loadTemplate(templateName) else {
+      let paths = loader.paths.map { $0.description }.joinWithSeparator(", ")
+      throw TemplateSyntaxError("'\(templateName)' template not found in \(paths)")
+    }
+
+    return try template.render(context)
+  }
+}
+