Made UC4/1 more formal by using elementary use case "reads".
TODO: rename "reads" to "lists" after requs bug is fixed (currently not recognized by requs as elementary use case)
Merge branch 'master' of https://github.com/yegor256/thindeck into 157
Decreased ambiguity by moving "lists" elementary use case from informal to a main use case flow UC4/1
Merge pull request #159 from antonxt/157

#159: pull request Made UC4/1 more formal by using elementary use case "reads".