phi-search: C-s that works with multiple-cursors

See:

https://github.com/zk-phi/phi-search
https://github.com/magnars/multiple-cursors.el/commit/bf0177205e0a11bc5fde9abae715c71f348219de
force ./node_modules/.bin into $PATH

which is friggin super stupid still, as I can't access the binaries from
a directory inside of the project:

    $ cd project-root/
    $ batman # fine
    $ cd src
    $ batman # no such file

ugh.
emacs i take back everything bad i ever said about you