Update rollup config/deps

[pshrmn]

I went ahead and updated all of the outdated Rollup dependencies, although my main reason for doing this is that my PR to rollup-plugin-commonjs was just merged and it makes the UMD builds a lot more readable. Instead of there being lots of index$1, index$2, etc. variable names (because they come from index.js files), those variables are now named using their parent directory.

Previous:

var index$6 = Array.isArray || function (arr) {
  return Object.prototype.toString.call(arr) == '[object Array]';
};

if (!index$6(keys)) {
  options = /** @type {!Object} */ (keys || options);
  keys = [];
}

Now:

var isarray = Array.isArray || function (arr) {
  return Object.prototype.toString.call(arr) == '[object Array]';
};

if (!isarray(keys)) {
  options = /** @type {!Object} */ (keys || options);
  keys = [];
}

[timdorr]

Oh nice! Thanks for doing this. I'll have to get it into Redux too!