added a basic test for waitForElementVisible
added a basic test for waitForElementVisible

pmstss/nightwatch,AlphaGit/nightwatch,beatfactor/nightwatch,lukaszw82/nightwatch,feedhenry/nightwatch,sknopf/nightwatch,sethmcl/nightwatch,joel-airspring/nightwatch,miguelangelrr6/originnightwatch,kpiwko/nightwatch,aedile/nightwatch,Crunch-io/nightwatch,nightwatchjs/nightwatch,munro/nightwatch,joel-airspring/nightwatch,vuthelinh/nightwatch,teleological/nightwatch,LucioFranco/nightwatch,awatson1978/nightwatch,iabw/nightwatch,gatero/nightwatch,CoderK/nightwatch,Crunch-io/nightwatch,vikki/nightwatch,campbellwmorgan/nightwatch,ervinb/nightwatch,matskiv/nightwatch,bluemind-net/nightwatch,ervinb/nightwatch,obulisaravanan/nightwatch,JonDum/nightwatch,mbixby/nightwatch,byron7g7/nightwatch,nightwatchjs/nightwatch,campbellwmorgan/nightwatch,aahill50/dibs-nightwatch,haggyj/nightwatch,prolificcoder/nightwatch,mobify/nightwatch