v0.27.0

• bigquery:
  • Allow modification of encryption configuration and partitioning options to a table via the Update call.
  • Add a SchemaFromJSON function that converts a JSON table schema.
• bigtable:
  • Restore cbt count functionality.
• containeranalysis:
  • Add v1beta client.
• spanner:
  • Fix a case where an iterator might not be closed correctly.
• storage:
  • Add ServiceAccount method https://godoc.org/cloud.google.com/go/storage#Client.ServiceAccount.
  • Add a method to Reader that returns the parsed value of the Last-Modified header.