Add a readByteArray() convenience method to Message, and simplify readVarInt.
Add a readByteArray() convenience method to Message, and simplify readVarInt.

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me/monetaryunitj,TrustPlus/trustpluscoinj,natzei/bitcoinj,cpacia/bitcoinj,HashEngineering/maxcoinj,MintcoinCommunity/mintcoinj,VishalRao/bitcoinj,sserrano44/bitcoinj-watcher-service,MonetaryUnit/monetaryunitj,tjth/bitcoinj-lotterycoin,tangyves/bitcoinj,jife94/bitcoinj,designsters/android-fork-bitcoinj,Coinomi/bitcoinj,cannabiscoindev/cannabiscoinj,HashEngineering/unobtaniumj,lavajumper/bitcoinj-scrypt,HashEngineering/namecoinj