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Bigtable v0.10.0

Breaking Changes
- The return type for WaitForConsistencyCheck() was a future<StatusOr<bool>>
  where most related functions return a bigtable::Consistency enum.
- Table::CheckAndMutateRow returns StatusOr<bool> to indicate which
  branch of the predicate was taken in the atomic change. Meanwhile,
  AsyncCheckAndMutateRow() returned a future<StatusOr<proto-with-long-name>>.
  Changed the async and sync versions to return
  future<StatusOr<MutationBranch>>. MutationBranch is an enum as
  StatusOr<bool> is too eay to use incorrectly.
- Removed the Collection template parameter from Table::SampleRows.
- Fixed the last function, WaitForConsistencyCheck, that returned
  std::future to return google::cloud::future<>. The function name
  changed too, to be more consistent with similar functions.
- Remove all the "strong types" for bigtable, such as InstanceId,
  ClusterId, TableId, etc. This changed some of the constructors for
  bigtable::Table and several member functions in bigtable::Table,
  bigtable::TableAdmin, and bigtable::InstanceAdmin.
Changes:
- Implemented TableAdmin::AsyncWaitForConsistency.
- Implemented Table::AsyncReadRows.
- DeleteAppProfile defaults to ignore_warnings=true.

Implemented option to read an object starting from an offset.
Automatically restart downloads on error. With this change the download is
restarted from the last received byte, and using the object generation used
in the original download as well. (#2693)
Bugfixes:
- Service account credentials not refreshing properly. (#2691)
- Fix build for macOS+CMake. (#2698)
- WriteObject now supports empty streams. (#2714)