Require features so step definitions can be found

The cucumber command, by virtue of using the `--require` option to
include the SlimJSON formatter, was not correctly including step
definitions that could be defined in sibling directories of the
features/ directory. It's necessary to explicitly include features/ to
get these included. Turns out one of the self-tests was wrong (expecting
error, meaning undefined step, instead of pass/fail like it should have
had). Fixed.

features/cuke_fixture.feature

@@ -139,7 +139,7 @@ Feature: Cuke fixture
       [
         ["report:Feature: Passing"],
         ["report:Scenario: Passing"],
-        ["error:Given a step passes"]
+        ["pass:Given a step passes"]
       ]
       """
 
@@ -148,7 +148,7 @@ Feature: Cuke fixture
       [
         ["report:Feature: Failing"],
         ["report:Scenario: Failing"],
-        ["error:Given a step fails"]
+        ["fail:Given a step fails"]
       ]
       """
 

lib/cukable/cuke.rb

@@ -304,13 +304,16 @@ def run_cucumber(feature_filenames)
       # Tell cucumber to require the directory where this file lives,
       # so it can find the SlimJSON formatter
       req = "--require #{File.expand_path(File.dirname(__FILE__))}"
+      req += " --require features"
       format = "--format Cucumber::Formatter::SlimJSON"
       output = "--out #{@output_dir}"
       args = @cucumber_args
       features = feature_filenames.join(" ")
+      cucumber_cmd = "cucumber #{req} #{format} #{output} #{args} #{features}"
 
-      #puts "cucumber #{req} #{format} #{output} #{args} #{features}"
-      system "cucumber #{req} #{format} #{output} #{args} #{features}"
+      in_project_dir do
+        system cucumber_cmd
+      end
 
       # TODO: Ensure that the correct number of output files were written
       #if !File.exist?(@results_filename)