Added classes to prepare for API key information retrieval. Added caching support to EveApiClient. Changed EveApiClient constructor to force an integer for the key ID to match the ApiKey class.
Added API key information retrieval functionality; still need to fix the access flags by adding all of the values in there.
Added character and corporation access mask enumerations. Changed the API key information response to give back the access mask as an int instead of an enum; there is not a nice way to support different enum types based on the API key type.
Made account status retrieval in the API core consistent by changing from XML to LINQ to just an XML element query; it makes more sense anyway.