feat(emacs): minor improvements to emacs mode
feat(emacs): minor improvements to emacs mode

Signed-off-by: Leonardo de Moura <7610bae85f2b530654cc716772f1fe653373e892@microsoft.com>

digama0/lean,avigad/lean,leanprover-community/lean,fpvandoorn/lean2,rlewis1988/lean,soonhokong/lean,fpvandoorn/lean,levnach/lean,soonhokong/lean-osx,fpvandoorn/lean,c-cube/lean,dselsam/lean,leodemoura/lean,rlewis1988/lean,c-cube/lean,codyroux/lean0.1,fpvandoorn/lean,digama0/lean,leanprover/lean,soonhokong/travis_test,dselsam/lean,eigengrau/lean,leanprover/lean,UlrikBuchholtz/lean,fgdorais/lean,leodemoura/lean,soonhokong/lean-windows,javra/lean,soonhokong/travis_test,eigengrau/lean,javra/lean,soonhokong/lean-osx,leodemoura/lean,fgdorais/lean,htzh/lean,avigad/lean,fgdorais/lean,soonhokong/lean,avigad/lean,codyroux/lean0.1,sp3ctum/lean,javra/lean,leanprover/lean,sp3ctum/lean,Kha/lean,soonhokong/lean-windows,leanprover/lean,avigad/lean,levnach/lean,fgdorais/lean,fgdorais/lean,fpvandoorn/lean2,rlewis1988/lean,johoelzl/lean,digama0/lean,soonhokong/lean-osx,htzh/lean,rlewis1988/lean,fpvandoorn/lean2,eigengrau/lean,digama0/lean,dselsam/lean,leanprover-community/lean,soonhokong/lean,UlrikBuchholtz/lean,c-cube/lean,codyroux/lean0.1,dselsam/lean,eigengrau/lean,fpvandoorn/lean,avigad/lean,UlrikBuchholtz/lean,htzh/lean,avigad/lean,johoelzl/lean,Kha/lean,leanprover-community/lean,sp3ctum/lean,Kha/lean,eigengrau/lean,fpvandoorn/lean,leanprover-community/lean,sp3ctum/lean,leanprover-community/lean,c-cube/lean,htzh/lean,levnach/lean,javra/lean,soonhokong/lean-osx,johoelzl/lean,Kha/lean,Kha/lean,htzh/lean,rlewis1988/lean,digama0/lean,soonhokong/travis_test,leanprover-community/lean,soonhokong/travis_test,sp3ctum/lean,soonhokong/lean-windows,johoelzl/lean,johoelzl/lean,levnach/lean,fgdorais/lean,dselsam/lean,soonhokong/lean-windows,soonhokong/lean,leanprover/lean,soonhokong/lean,fpvandoorn/lean,Kha/lean,codyroux/lean0.1,leodemoura/lean,digama0/lean,soonhokong/lean-windows,leanprover/lean,johoelzl/lean,fpvandoorn/lean2,leodemoura/lean,fpvandoorn/lean2,c-cube/lean,leodemoura/lean,rlewis1988/lean,javra/lean,levnach/lean,UlrikBuchholtz/lean,soonhokong/lean-osx,dselsam/lean,UlrikBuchholtz/lean