mle-monitor, GCS sync refactor, examples

Added

• Introduces experimental notebook-friendly MLELauncher which allows you to schedule experiments from within a local notebook.
• Adds mle protocol subcommand to get a quick view of the last experiments and their status.
• Adds mle project to initialize a new project based on cloning the mle-project repository.

Changed

• Refactors out resource monitoring and protocol database to mle-monitor sub-package.
• Refactors out job launching and status monitoring to mle-launcher sub-package.
• Moves population-based training and hypothesis testing into experimental submodule.
• Moves documentation page to mle-docs sub-repository.