Rename Encrypt to EncryptWithCryptoKeyPub in internal_test.go

Also combine managerTx.ExistsSeries into ExistsSeriesTestsOnly
Merge pull request #27 from gsalgado/vp

Rename Encrypt to EncryptWithCryptoKeyPub in internal_test.go
Added private keys to series data in LoadAllSeries and added tests in the corresponding test
Merge pull request #23 from jimmysong/vp

Added private keys to series data in LoadAllSeries and added tests in the corresponding test
Add ReplaceSeries and refactor the CreateSeries function into smaller steps
Merge pull request #25 from larshesel/vp

Add ReplaceSeries and refactor the CreateSeries function into smaller steps
Merge pull request #25 from larshesel/vp

Add ReplaceSeries and refactor the CreateSeries function into smaller steps
Merge branch 'vp' of https://github.com/monetas/btcwallet into vp
Add more error codes and messages, refine some doc comments.