ETCH-249 Added EtchNumber class

Etch number types derive now from EtchNumber
BinaryTaggedDataOutput uses EtchNumber to get the value

Change-Id: I7a487dcab3e6f489083031008ca91912da7655d0

git-svn-id: https://svn.apache.org/repos/asf/incubator/etch/trunk@1399112 13f79535-47bb-0310-9956-ffa450edef68
14 files changed