take advantage of play 2.2 json improvements in wiki module

wiki/src/main/Api.scala

@@ -2,6 +2,7 @@ package lila.wiki
 
 import lila.db.Types.Coll
 import lila.db.api._
+import tube._
 import play.api.libs.concurrent.Execution.Implicits._
 
 final class Api(implicit coll: Coll) {

wiki/src/main/Fetch.scala

@@ -2,6 +2,7 @@ package lila.wiki
 
 import lila.db.Types.Coll
 import lila.db.api._
+import tube._
 
 import java.io.File
 import com.google.common.io.Files
@@ -24,7 +25,7 @@ private[wiki] final class Fetch(gitUrl: String)(implicit coll: Coll) {
 
   private def filePage(file: File): Option[Page] = {
     val name = """^(.+)\.md$""".r.replaceAllIn(file.getName, _ group 1)
-    (name != "Home") option Pages(name, toHtml(fileContent(file)))
+    (name != "Home") option Page.make(name, toHtml(fileContent(file)))
   }
 
   private def getFiles: Fu[List[File]] = Future {

wiki/src/main/Page.scala

@@ -5,17 +5,22 @@ case class Page(id: String, name: String, title: String, body: String) {
   def slug = id
 }
 
-object Pages {
+object Page {
 
   import java.text.Normalizer
   import java.util.regex.Matcher.quoteReplacement
 
-  def apply(name: String, body: String): Page = new Page(
+  def make(name: String, body: String): Page = new Page(
     id = dropNumber(slugify(name)),
     name = name,
     title = dropNumber(name.replace("-", " ")),
     body = body)
 
+  import lila.db.Tube
+  import play.api.libs.json._
+
+  val tube = Tube(Json.reads[Page], Json.writes[Page]) 
+
   // does not lowercase
   private def slugify(input: String) = {
     val nowhitespace = input.replace(" ", "_")

wiki/src/main/package.scala

@@ -1,12 +1,9 @@
 package lila
 
-import lila.db._
-import play.api.libs.json._
-
 package object wiki extends PackageObject with WithPlay {
 
-  implicit lazy val pageTube = Tube(
-    Json.reads[Page], 
-    Json.writes[Page]
-  ) inColl Env.current.pageColl
+  object tube {
+
+    implicit lazy val pageTube = Page.tube inColl Env.current.pageColl
+  }
 }