Rocketeer 2.0 roadmap

# Features
- [x] Refactor the parts that needed it
- [x] Parallel deployments
- [x] Multiservers connections
- [x] Recognize contextual configuration files/folders without the need for includes
- [x] More informations on which task/event is running
- [x] Create DependenciesStrategy and make Composer a concrete of it
- [x] Add a PolyglotStrategy that installs dependencies through common PM (Bundler, NPM, Bower, etc)
- [x] Timer class that stores how long each task takes and display an average time to completion on average
- [x] Track down performances holes and work on connections caching
- [x] Rsync DeploymentStrategy
- [x] Decouple the Check task into a Check strategy with language implementations (PHP project, Ruby project)
- [x] Polyglot CheckStrategy that checks requirements for multi-language applications
- [x] Make AbstractNotifier fire an actual Notification task for clarity in the deployment log
- [x] JavascriptCheckStrategy
- [x] Overhauled plugin usage (ability to install, publish plugins outside of Laravel/PHP apps)

# Plugins
- [x] Official HipChat plugin (#158)

# Support
- [ ] HHVM Support

# Documentation
- [x] Add an automatically generated API
- [x] Split documentation sections in different pages
- [x] Document all breaking changes, namespace changes, etc.
- [x] Document the new Binaries system, how to use it, how to create Binaries
- [x] Document the new Strategy system, how to use it, how to create Strategies
- [x] Add queues and explainer documentation