"External Documentation Object" implemented (according to spec)

Depends on https://github.com/wordnik/swagger-core/pull/716

src/main/java/com/wordnik/swagger/codegen/CodegenModel.java

@@ -12,4 +12,5 @@ public class CodegenModel {
   public List<CodegenProperty> vars = new ArrayList<CodegenProperty>();
   public Set<String> imports = new HashSet<String>();
   public Boolean hasVars, emptyVars, hasMoreModels;
+  public ExternalDocs externalDocs;
 }

src/main/java/com/wordnik/swagger/codegen/CodegenOperation.java

@@ -1,7 +1,6 @@
 package com.wordnik.swagger.codegen;
 
 import com.wordnik.swagger.models.*;
-import com.wordnik.swagger.models.properties.*;
 
 import java.util.*;
 
@@ -23,6 +22,7 @@ public class CodegenOperation {
 
   public Set<String> imports = new HashSet<String>();
   public List<Map<String, String>> examples;
+  public ExternalDocs externalDocs;
 
   // legacy support
   public String nickname;

src/main/java/com/wordnik/swagger/codegen/DefaultCodegen.java

@@ -325,6 +325,7 @@ public class DefaultCodegen {
     m.classname = toModelName(name);
     m.classVarName = toVarName(name);
     m.modelJson = Json.pretty(model);
+    m.externalDocs = model.getExternalDocs();
     int count = 0;
     if(model instanceof ArrayModel) {
       ArrayModel am = (ArrayModel) model;
@@ -775,7 +776,7 @@ public class DefaultCodegen {
 
     if(op.allParams.size() > 0) 
       op.hasParams = true;
-
+    op.externalDocs = operation.getExternalDocs(); 
     return op;
   }
 

src/main/java/com/wordnik/swagger/codegen/DefaultGenerator.java

@@ -136,7 +136,9 @@ public class DefaultGenerator implements Generator {
       bundle.put("models", allModels);
       bundle.put("apiFolder", config.apiPackage().replaceAll("\\.", "/"));
       bundle.put("modelPackage", config.modelPackage());
-
+      if (swagger.getExternalDocs() != null) {
+        bundle.put("externalDocs", swagger.getExternalDocs());
+      }
       for(int i = 0; i < allModels.size() - 1; i++) {
         HashMap<String, CodegenModel> cm = (HashMap<String, CodegenModel>) allModels.get(i);
         CodegenModel m = cm.get("model");