Add Move support.
Add Move support.

This commit adds the Move, MoveAsync, MoveMinConf, MoveMinConfAsync,
MoveComment, and MoveCommentAsync functions for issuing the "move" RPC
with various optional parameters.

Closes #16.

btcsuite/btcrpcclient,tb00/btcd,ppcsuite/ppcd,aakselrod/btcrpcclient,davecgh/btcd,aakselrod/btcd,Stash-Crypto/btcd,dajohi/btcd,btcsuite/btcd,tb00/btcd,ppcsuite/btcrpcclient,Roasbeef/btcd,ltcsuite/ltcd,wallclockbuilder/btcd,jrick/btcd,jrick/btcrpcclient,wallclockbuilder/btcrpcclient,jrick/btcd,wallclockbuilder/btcd,runeaune/btcrpcclient,decred/dcrd,jrick/btcrpcclient,runeaune/btcrpcclient,ppcsuite/btcrpcclient,Roasbeef/btcd,wallclockbuilder/btcrpcclient,dajohi/btcd,davecgh/btcrpcclient,FactomProject/btcrpcclient,jrick/dcrd,decred/dcrd,jrick/btcd,FactomProject/btcrpcclient,jrick/dcrd,btcsuite/btcd,ltcsuite/ltcd,ppcsuite/ppcd,btcsuite/btcrpcclient,Stash-Crypto/btcd,dajohi/btcd,davecgh/btcd,aakselrod/btcd,aakselrod/btcrpcclient