Create heroku buildpack for perk and gitignore minified files

[alarner]

Right now we have to include bundle.min.js and main.scss.min.css in the repository because heroku will not let you build new files or write to the filesystem unless you have a custom buildpack. In order to streamline the deployment process and clean up git repos for perk apps we need to:

1. create a custom buildpack
2. add the min files (css and js) to the .gitignore
3. update the perk docs accordingly

[alarner]

Turns out a custom buildpack is not necessary. Instead we can use the heroku-postbuild hook in the package.json file. Things to do:

• [x] Fix error when trying to access a page that needs login when not logged in. For example /dashboard. Error is First argument to Howhap constructor must be an object.
• [x] Re-implement npm run config and npm run dev check for local.js configuration file
• [x] Update documentation for new heroku build process
• [x] Add configuration setting to use polling for browserify
• [x] Add configuration setting to use polling for webpack
• [x] Update documentation for new build configuration settings

We will also add support for webpack (#3)

[alarner]

Fixed in #23