Upgrade project and fix functions module

• Added Dockerfile for server application (https://hub.docker.com/r/andersonba/whoami.js)
• Fixed the functions module on running async/sync (configurable timeout)
• Upgrade Eslint and fix lint errors
• Upgrade others packages

New callback and fix bugs

• Support for me.execute method with callback (if you configured on instance, two callbacks are called)
• Fix bug on instantiate callback as first argument whoami(function(...
• Fix bug on define functions filters without results
• Fix spec async tests with sinon fake timers

Client refactoring

• Support for custom api
• Configure filters in options (before options.filters)
• Callback support
• Remove cloudinary and slack integration
• Add server api example

v1.1.3

• Add sessionStorage (by @ernestorocha)