Fix indentation in app/index.js
Add gitignore template.
Add .yeti.json template.
Add BUILD.md, README.md, and Gruntfile.js templates.
Just rimraf before tests, so the output can be inspected manually.
Add expected files to test.
Templatize Gruntfile and README/BUILD.md, keeping Grunt interpolations live.
Convert old template syntax in project files.
Add project-level prompts.