Fixed yard LoadError message, and added yard/cucumber development dependencies.
Fixed yard LoadError message, and added yard/cucumber development dependencies.

jarib/jeweler,technicalpickles/jeweler,dldinternet/jeweler,dldinternet/jeweler,flajann2/juwelier,technicalpickles/jeweler,flajann2/juwelier,dkastner/bueller,flajann2/juwelier