Removed redundant expression in equals() method of class DropServer
Added field "id" to equals() method of class SyncSettingItem
Removed unneeded method call in ConfigSerializationTest
corrected from other.deleted to other.id
Merge pull request #236 from f-porter/Issue-235-Correct-some-wrong-stuff-in-config-classes

Issue 235 correct some wrong stuff in config classes