some windows related path fixes (in the test suite)
update generator tests to have platform independent line-endings.
Don't error without vendor/

Fixes #1560
Merge pull request #1577 from bcardarella/bc-dont-fail-without-vendor

Don't error without vendor/
Update CONTRIBUTING.md
Merge pull request #1575 from stefanpenner/line-endings

Line endings
Fixes #1477, avoid creation of app.css on update if another style file is present