Add 'Namespace' a container for tags and filters

StencilSpecs/ParserSpec.swift

@@ -6,7 +6,7 @@ describe("TokenParser") {
   $0.it("can parse a text token") {
     let parser = TokenParser(tokens: [
       Token.Text(value: "Hello World")
-    ])
+    ], namespace: Namespace())
 
     let nodes = try parser.parse()
     let node = nodes.first as? TextNode
@@ -18,7 +18,7 @@ describe("TokenParser") {
   $0.it("can parse a variable token") {
     let parser = TokenParser(tokens: [
       Token.Variable(value: "'name'")
-    ])
+    ], namespace: Namespace())
 
     let nodes = try parser.parse()
     let node = nodes.first as? VariableNode
@@ -30,7 +30,7 @@ describe("TokenParser") {
   $0.it("can parse a comment token") {
     let parser = TokenParser(tokens: [
       Token.Comment(value: "Secret stuff!")
-    ])
+    ], namespace: Namespace())
 
     let nodes = try parser.parse()
     try expect(nodes.count) == 0
@@ -39,7 +39,7 @@ describe("TokenParser") {
   $0.it("can parse a tag token") {
     let parser = TokenParser(tokens: [
       Token.Block(value: "now"),
-    ])
+    ], namespace: Namespace())
 
     let nodes = try parser.parse()
     try expect(nodes.count) == 1
@@ -48,7 +48,7 @@ describe("TokenParser") {
   $0.it("errors when parsing an unknown tag") {
     let parser = TokenParser(tokens: [
       Token.Block(value: "unknown"),
-    ])
+    ], namespace: Namespace())
 
     try expect(try parser.parse()).toThrow(TemplateSyntaxError("Unknown template tag 'unknown'"))
   }