improve transpiler name (for logging/traces)
improve transpiler name (for logging/traces)

rwjblue/broccoli-babel-transpiler,babel/broccoli-babel-transpiler,givanse/broccoli-babel-transpiler,kellyselden/broccoli-babel-transpiler,tildeio/broccoli-babel-transpiler,tildeio/broccoli-typescript-compiler,jayphelps/broccoli-babel-transpiler,chadhietala/broccoli-babel-transpiler,tildeio/broccoli-typescript-compiler,philipbjorge/broccoli-typescript-compiler,philipbjorge/broccoli-typescript-compiler,joliss/broccoli-babel-transpiler,smfoote/broccoli-babel-transpiler