v0.7.0 Release

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.tar.gz	06bc735a117ec7ea92ea580e7f2ffa4b1cd7539e0e04f847bf500588d7f0fe90
.zip	21a7a03d48697450b300cedd346934831e324497d1a58b3ba2f4d19d9b69ead2

Bigtable

• Breaking change: Return StatusOr<> from TableAdmin and InstanceAdmin
  operations to signal errors.
• Add streaming to (Async)BulkMutator.
• Implement a helper class (MutationBatcher) to automatically batch and manage
  outstanding bulk mutations.
• Add bigtable::Cell constructors without labels argument.
• Implementation of RowSet example using discontinuous keys.
• List{Instances,Clusters} return failed_locations.
• First version of async Apply batching.
• Keep Apply callbacks in MutationData.

Storage

• Properly handle subresources in V2 signed URLs.
• Allow specifying non-default ServiceAccountCredentials scope and subject.
• Add make install instructions.
• Change the storage examples to throw a std::runtime_error on failure.
• Add Bucket Policy Only samples.

Common

• Breaking change: Make google::cloud::optional::operator bool() explicit.
• Add google::cloud::optional value conversions that match std::optional.
• Stop using grpc's DO_NOT_USE enum.
• Remove ciso646 includes to force traditional spellings.
• Change std::endl -> "\n".
• Enforce formatting of .cc files.