remove artifact pushing from travis build
remove artifact pushing from travis build

This feature was unused in the bel.rb build and the paths were never
configured quite right. In the future we should depend more on an
instance of rake-compiler-dev-box that we control.

nbargnesi/bel.rb,nbargnesi/bel.rb,nbargnesi/bel.rb,OpenBEL/bel.rb,OpenBEL/bel.rb,nbargnesi/bel.rb,nbargnesi/bel.rb,OpenBEL/bel.rb,OpenBEL/bel.rb,nbargnesi/bel.rb,OpenBEL/bel.rb,OpenBEL/bel.rb,OpenBEL/bel.rb