Merge pull request #2 from Anahkiasen/master

Update README.md
Add Task::listContents and Task::fileExists
Add ability to pass just a Task to fireTasksQueue
Add ability to pass base class of Rocketeer Tasks to Task::executeTask
Add basic deploy:check command, make deploy:setup use it beforehand
Move the logic behind Task::executeTask to TasksQueue::buildTask
Make Task::runComposer take into account a local `composer.phar`
Add Task helper to run outstanding migrations
Update README
Fix some docblocks
Add ability to create custom tasks integrated in the CLI
Add Rocketeer::add method on the facade to register custom Tasks
Remove checkboxes
Tweak CHANGELOG.md
Add some tests
Remove checkboxes
Add some comments
Better Task::fileExists
Add ability to share files and folders between releases
Update tests