More reliability fixes including:

README updates after doing an install on Ubuntu 17.10.

Improve reliability by:

Be more resilient to Redis failures.

Check IO task wait time to know when writes are fully finished.

Add tenative support for tags.

Tweak file loading to wait until the OS is done. Also increase timeouts.

Add a random portion to the filename so it doesn't get deleted by another board's testing.

Remove the GitHub webhook and load code when Travis starts. This

Fix binary variable scope.

Handle more errors when creating filename and allow for more retries.

Support storing binary artifacts temporarily for testing.

Add ability to fetch code from other forks.

Improved docs that cover set up in more detail.

Ignore .rosie.yml