bundler trait infinite loop on windows

[dub357]

If warbler cannot find the bundler.gemspec (a problem when bundler is installed as a 'default' gem via rubygems and likely a separate issue), then the search through the parent directory tree results in an infinite loop on Windows because the check (which uses a regular expression) only ends the loop if the path is either "." or "/". Neither of these represents the root path on Windows.

warbler/lib/warbler/traits/bundler.rb

Line 48 in 5ce7ec0

if full_gem_path.to_s =~ /^[\.\/]$/