Add cucumber checker for cucumber files

For now, it only detects undefined steps. The nearest `features` dir
above the buffer file is loaded, so step definitions should be found
correctly.

Tested only with Cucumber for Ruby, but it should work for any cucumber
that follows a substantially similar directory structure.

1 files changed, 0 insertions, 0 deletions

diff --git a/test/cucumber_fixtures/features/cuke.feature b/test/cucumber_fixtures/features/cuke.feature
new file mode 100644
index 00000000..e69de29b
--- /dev/null
+++ b/test/cucumber_fixtures/features/cuke.feature