modularize the webpack to meteor process

[jedwards1211]

What I ultimately want is to be able to do the following:

require('shelljs/global');
var webpack2meteor = require('webpack2meteor');
var dirs = require('./dirs');
var serverConfig = require('./webpack/webpack.config.server.dev.js');
var clientConfig = require('./webpack/webpack.config.client.dev.js');

webpack2meteor(serverConfig, {meteor: dirs.meteor, target: 'server', mode: 'development'}, function(err) {
  if (err) return;
  webpack2meteor(clientConfig, {meteor: dirs.meteor, target: 'client', mode: 'development'}, function(err) {
    if (err) return;
    cd(dirs.meteor);
    exec('meteor', {async: true});
  });
});

This would make it possible to handle advanced Webpack use cases, especially code splitting, and allow users to get the latest improvements via the npm package rather than having to continually merge this skeleton project into their code.

[jedwards1211]

Actually now I'm thinking of using Webpack plugins to handle this, so that users can just put the plugin in their webpack configs and run Webpack however they want.

[jedwards1211]

Btw, my solution exists in the webpack-meteor-tools branch now. It's not quite ready for prime time but it basically works