2.0.5

#1856 Fix DisableDirectStreaming not taking on error responses
#1860 Fix deserialization exception on GetIndex() when refresh_interval == -1
#1868 Add support for term filtering on _termvector and _mtermvector
#1880 Fix handling of the month/year intervals and serialization fixes for the Time class
#1887 Fix handling of return types when using the low-level client (ty @rossbrower)
#1901 Fix deserialization of known errors even if the response isn't valid JSON
#1904 Fix OnRequestCompleted not invoked when an exception is thrown