Spanner Deployment (#1561)

* DB_NAME and DB_ENGINE flags

* Use noop quota

Spanner doesn't have a quota impl

* DB_ENGINE=cloud_spanner

Inject GOOGLE_APPLICATION_CREDENTIALS

* Cloudspanner flags

* Set master hold interval

* server -v=3

* Set sequencer batch size

* pin trillian docker

* go get github.com/google/trillian@v1.3.10

* remove mysql sidecar

* proper proto copy

Use inert metric factory (#1525)

Revert "Readme Objective Section (#1488)" (#1509)

This reverts commit 71b08fc.

New Design Doc (#1469)

* Key Transparency 2.0 Design Doc

Go Module Support

- Go module support
- Performance improvements
- Better integraion tests

Fixes #1385

Nonblocking PublishRevisions (#1149)

* Add block parameter to PublishRevisionsRequest

* Nonblocking path

Nonblocking PublishRevisions (#1149)

* Add block parameter to PublishRevisionsRequest

* Nonblocking path

Write to Trillian Map At Revision (#1146)

Resolves #1119