add suport for java.math.BigDecimal
add suport for java.math.BigDecimal

dacr/json4s,seratch/json4s,lmtjalves/json4s,xuwei-k/json4s,tramchamploo/json4s,aoiroaoino/json4s,karolx/json4s,yanns/json4s,depop/json4s,json4s/json4s,geggo98/json4s,dozed/json4s,tmatvienko/json4s,ocadaruma/json4s,xuwei-k/json4s,json4s/json4s,ponkotuy/json4s