Merge features complete, creating users and articles as expected. Next
step: adding a new form (merge form) to the View
Edit screen shows the merge_with form, it invokes the correct action in
the content_controller.rb; next step: implementing the Model

Forgot to stage this changes in the previous commit
Legacy HW2 done; cuke features and specs green; merging articles as
expected
bug on content_controller corrected
finally corrected.
Corrected bugs after deploy on heroku
Removed the debugger line