Go 1.15, docker-compose, SQLite

• Added support for Go 1.15.
• Added compose file.
• Added SQLite example.

Thanks goes to @Skeeve for those contributions!

New API and Go 1.9

Refactor library API and provide more helpers. Support Go 1.9.

* Support for Go 1.9

* Refactor and rewrite most of API surface

* Merged SDK Dockerfile into repository

* Provide helpers for networking, certs and wrapper for CLI apps

* Add README