Add NameTag visibility API to the Team interface.

src/main/java/org/bukkit/scoreboard/NameTagVisibility.java

@@ -0,0 +1,21 @@
+package org.bukkit.scoreboard;
+
+public enum NameTagVisibility {
+
+    /**
+     * Always show the player's nametag.
+     */
+    ALWAYS,
+    /**
+     * Never show the player's nametag.
+     */
+    NEVER,
+    /**
+     * Show the player's nametag only to his own team members.
+     */
+    HIDE_FOR_OTHER_TEAMS,
+    /**
+     * Show the player's nametag only to members of other teams.
+     */
+    HIDE_FOR_OWN_TEAM;
+}

src/main/java/org/bukkit/scoreboard/Team.java

@@ -110,6 +110,22 @@ public interface Team {
      */
     void setCanSeeFriendlyInvisibles(boolean enabled) throws IllegalStateException;
 
+    /**
+     * Gets the team's ability to see name tags
+     *
+     * @return the current name tag visibilty for the team
+     * @throws IllegalArgumentException if this team has been unregistered
+     */
+    NameTagVisibility getNameTagVisibility() throws IllegalArgumentException;
+
+    /**
+     * Set's the team's ability to see name tags
+     *
+     * @param visibility The nameTagVisibilty to set
+     * @throws IllegalArgumentException if this team has been unregistered
+     */
+    void setNameTagVisibility(NameTagVisibility visibility) throws IllegalArgumentException;
+
     /**
      * Gets the Set of players on the team
      *