added acceptance test for unicode plugin names
added acceptance test for unicode plugin names

tomviner/pytest,nicoddemus/pytest,txomon/pytest,hackebrot/pytest,tareqalayan/pytest,pfctdayelise/pytest,Akasurde/pytest,tomviner/pytest,alfredodeza/pytest,rmfitzpatrick/pytest,The-Compiler/pytest,flub/pytest,pytest-dev/pytest,davidszotten/pytest,ddboline/pytest,RonnyPfannschmidt/pytest,nicoddemus/pytest,MichaelAquilina/pytest,The-Compiler/pytest,markshao/pytest