added methods to retrieve teams

src/main/java/org/kohsuke/github/GHRepository.java

@@ -145,6 +145,14 @@ public class GHRepository {
         return Collections.unmodifiableSet(r);
     }
 
+    /**
+     * If this repository belongs to an organization, return a set of teams.
+     */
+    public Set<GHTeam> getTeams() throws IOException {
+        return Collections.unmodifiableSet(root.retrieve("/repos/show/"+owner+"/"+name+"/teams",JsonTeams.class).toSet(
+                root.getOrganization(owner)));
+    }
+
     public void addCollaborators(GHUser... users) throws IOException {
         addCollaborators(asList(users));
     }

src/main/java/org/kohsuke/github/JsonTeams.java

@@ -1,7 +1,9 @@
 package org.kohsuke.github;
 
+import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Set;
 import java.util.TreeMap;
 
 /**
@@ -18,4 +20,13 @@ class JsonTeams {
         }
         return r;
     }
+
+    Set<GHTeam> toSet(GHOrganization org) {
+        Set<GHTeam> r = new HashSet<GHTeam>();
+        for (GHTeam t : teams) {
+            t.org = org;
+            r.add(t);
+        }
+        return r;
+    }
 }