strip trailing slashes from .gitignore to standardize (and to match regex in travis.yml) (#4075)
strip trailing slashes from .gitignore to standardize (and to match regex in travis.yml) (#4075)


PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs