Fix `berks viz` when `pwd` contains spaces
Remove additional newline at the end of metadata.rb template
Use single-quotes where no string interpolation is required

This fixes rubocop complaints
Remove spaces at end of line in Vagrantfile
Fix indent in Vagrantfile

This fixes the indention in the resulting Vagrantfile, fixing complaints from rubocop
Adapt init_generator_spec
Merge pull request #1301 from chr4/fix-linting-issues-add-rubocop

Fix linting issues