v0.2.0

MetabolomicsWorkbenchAPI v0.2.0

Diff since v0.1.0

• version 0.2.0
• corrected example of fetch_samples
• added fetching function to get total subjects
• added fetching study summary and throw an error if study does not match
• added test to get study info
• modify fetch _properties when all are missing

Merged pull requests:

• Dev (#13) (@GregFa)
• Dev (#14) (@GregFa)