foreman added to gemfile

Without foreman in gemfile app didn't wanted to start
Readme exteded

Added npm install command so node required packages are installed
Merge pull request #9 from 2can/installation

Installation
Readme

Requirements first
Merge pull request #10 from 2can/installation

Readme
feature(workers): workers architecture and organization

Better modularization for settings and workers execution.
Passing data to workers as parameters. `id` is used as the reference
on the view.
Added Facebook widget which counts likes for given page.