Find readmes in path
Implement readme rendering

Next step (over the weekend): add tests for readme rendering.
Test README rendering
Test loading of renderable readmes
Make 'em readmes mighty purty
Roll our own box style for readmes
Use a table in repo listing
Run repo_actions_test against a real repo

test/fixtures/dolt-test-repo.git contains a real Git repository, we'll
use this for testing.
Let's put a README in there
Extract git repo check into Dolt::Git

We need this in Dolt too.
Bump version
Updat views for new UI