Fix routing when start and target are on the same segment

Fixes issue #1864. Given the simple set-up:

a --> b --> c
^-----------|

This would translate into an edge based graph (ab) -> (bc),
(bc) -> (ca), (ca) -> (ab).

Starting at the end of the one-way street (ab) and going to
the beginning, the query has to find a self-loop within the
graph (ab) -> (bc) -> (ca) -> (ab), as both nodes map to the
same segment (ab).

features/support/data.rb

@@ -263,7 +263,7 @@ def extract_data
       raise ExtractError.new $?.exitstatus, "osrm-extract exited with code #{$?.exitstatus}."
     end
     begin
-      ["osrm","osrm.names","osrm.restrictions","osrm.ebg","osrm.edges","osrm.fileIndex","osrm.geometry","osrm.nodes","osrm.ramIndex"].each do |file|
+      ["osrm","osrm.names","osrm.restrictions","osrm.ebg","osrm.enw","osrm.edges","osrm.fileIndex","osrm.geometry","osrm.nodes","osrm.ramIndex"].each do |file|
         log "Renaming #{osm_file}.#{file} to #{extracted_file}.#{file}", :preprocess
         File.rename "#{osm_file}.#{file}", "#{extracted_file}.#{file}"
       end