Output lint fixes when tools/sigh lint --fix is run (#1553)
Output lint fixes when tools/sigh lint --fix is run (#1553)

Fixes #1552
PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs,PolymerLabs/arcs