Refactor make_lazy
Start on make lazy dots
Uncomment code that should work
Version of make_lazy_dots that works
Name output of lazy_dots
Add lazy_dots class and as.lazy_dots generic
Teach lazy_eval how to work with lazy_dots
Add note about lazy_dots in vignette and readme
Better lazy implementation. Add benchmark vignette
Merge branch 'master' of github.com:hadley/lazy