Updated README.md with Travis CI master build
Updated README.md with Travis CI master build

martypenner/emberx-select,arenoir/emberx-select,gte451f/emberx-select,steveklabnik/emberx-select,stefanpenner/emberx-select,arenoir/emberx-select,gte451f/emberx-select,stefanpenner/emberx-select,jeffreybiles/emberx-select,steveklabnik/emberx-select,thefrontside/emberx-select,tejasmanohar/emberx-select,tejasmanohar/emberx-select,knownasilya/emberx-select,knownasilya/emberx-select,jeffreybiles/emberx-select,thefrontside/emberx-select,martypenner/emberx-select