Update ToJson Serialization extension methods

[briandek]

Need to cleanup/remove and update serialization using DataContractJsonSerializer

[briandek]

updated - might need to refactor to take into account container Model Objects.

For example:
Realms are obtained when serializing RealmsData, we return IEnumerable Realms
GuildPerks are obtained when serializing GuildPerksData, we return IEnumerable Perks
GuildRewards are obtained when serializing GuildRewardsData, we return IEnumerable Rewards

so when converting to Json again we need to take into account we can't just convert the IEnumerable Realms object but we need to hold onto or create a new RealmsData object that will hold the Realms object and convert RealmsData

something like
RealmsData newRealmsData = new RealmsData();
RealmsData.Realms = Realms;

string jsonString = ExplorerUtil.ToJSON(newRealmsData);