Tools: added railroady to Gemfile; updated .gitignore
Debugger: changed from ruby-debug19 to debugger
HW1-1B Scenario 1: A non-admin should not be able to merge
PT: 65948178

* Added merge_articles.feature to contain all the features/scenarios for HW1-1
* Added scenarios for logging in as admin and as publisher and checking for
*   expected existence/non-existence of merge articles feature
* Added corresponding step definitions and paths.
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