Update objc client.

* Add test cases for deserialization.
* Pretty print model infomation.

samples/client/petstore/objc/SwaggerClient/SWGCategory.m

@@ -1,7 +1,7 @@
 #import "SWGCategory.h"
 
 @implementation SWGCategory
-  
+
 + (JSONKeyMapper *)keyMapper
 {
   return [[JSONKeyMapper alloc] initWithDictionary:@{ @"id": @"_id", @"name": @"name" }];
@@ -19,4 +19,8 @@
   }
 }
 
+- (NSString *)description {
+    return [[self toDictionary] description];
+}
+
 @end

samples/client/petstore/objc/SwaggerClient/SWGOrder.m

@@ -1,7 +1,7 @@
 #import "SWGOrder.h"
 
 @implementation SWGOrder
-  
+
 + (JSONKeyMapper *)keyMapper
 {
   return [[JSONKeyMapper alloc] initWithDictionary:@{ @"id": @"_id", @"petId": @"petId", @"quantity": @"quantity", @"shipDate": @"shipDate", @"status": @"status", @"complete": @"complete" }];
@@ -19,4 +19,8 @@
   }
 }
 
+- (NSString *)description {
+    return [[self toDictionary] description];
+}
+
 @end

samples/client/petstore/objc/SwaggerClient/SWGPet.m

@@ -1,7 +1,7 @@
 #import "SWGPet.h"
 
 @implementation SWGPet
-  
+
 + (JSONKeyMapper *)keyMapper
 {
   return [[JSONKeyMapper alloc] initWithDictionary:@{ @"id": @"_id", @"category": @"category", @"name": @"name", @"photoUrls": @"photoUrls", @"tags": @"tags", @"status": @"status" }];
@@ -19,4 +19,8 @@
   }
 }
 
+- (NSString *)description {
+    return [[self toDictionary] description];
+}
+
 @end

samples/client/petstore/objc/SwaggerClient/SWGTag.m

@@ -1,7 +1,7 @@
 #import "SWGTag.h"
 
 @implementation SWGTag
-  
+
 + (JSONKeyMapper *)keyMapper
 {
   return [[JSONKeyMapper alloc] initWithDictionary:@{ @"id": @"_id", @"name": @"name" }];
@@ -19,4 +19,8 @@
   }
 }
 
+- (NSString *)description {
+    return [[self toDictionary] description];
+}
+
 @end

samples/client/petstore/objc/SwaggerClient/SWGUser.m

@@ -1,7 +1,7 @@
 #import "SWGUser.h"
 
 @implementation SWGUser
-  
+
 + (JSONKeyMapper *)keyMapper
 {
   return [[JSONKeyMapper alloc] initWithDictionary:@{ @"id": @"_id", @"username": @"username", @"firstName": @"firstName", @"lastName": @"lastName", @"email": @"email", @"password": @"password", @"phone": @"phone", @"userStatus": @"userStatus" }];
@@ -19,4 +19,8 @@
   }
 }
 
+- (NSString *)description {
+    return [[self toDictionary] description];
+}
+
 @end