Expose component size variable as command-line option (this allows testing of big/small components in cucumber tests).

Add ability to pass extra parameters to  during tests.
Limit distance table search so that it doesn't return any big components if they're beyond max_distance.

features/step_definitions/data.rb

@@ -6,6 +6,10 @@ Given(/^the import format "(.*?)"$/) do |format|
   set_input_format format
 end
 
+Given /^the extract extra arguments "(.*?)"$/ do |args|
+    set_extract_args args
+end
+
 Given /^a grid size of (\d+) meters$/ do |meters|
   set_grid_size meters
 end