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
CreateSeries now errors out if given duplicate keys

Also adds a new test to check most possible errors returned by CreateSeries