remove test group from rspec
replace rspec with thor for dummy gem
use anvilness branch of slug-compiler
Remove compiler option in favor of slug-compiler version
fetch manifest-based buildpack
set temp buildpack dir as dir
bundle exec slug-compiler
use binstubs for slug-compiler
specify slug-compiler version
bah...try hardcoding /vendor/bundle/bin/slug-compiler
bah, bah...try hardcoding $root_dir/vendor/bundle/bin/slug-compiler