remove esindent dependency and move logic back into esformatter. see #114
replace util/token with rocambole-token. see #93
remove util/insert since it's redundant
replace util/ast with rocambole-node
split lineBreak & whiteSpace into individual pkgs, killing the "utils" folder.

this will make it easier to navigate between files and will encourage us to
split the whiteSpace and lineBreak logic into multiple modules as needed.

see #114