Mostly PSR-2 compliant

There is one fail related to extending a CakePHP core method that is not yet PSR-2 compliant as it begins with an underscore
Make travis PSR-2 aware
Ensure new Migration baking task is PSR2-compliant
Properly indent docblocks
Remove extra comments

CakePHP core code generally does not have comments inside of methods - this indicates that the method should be refactored - and these methods certainly do not need comments.
Add future-proof displayHelp() method

The underscored version can be removed when the CakePHP core becomes PSR-2 compliant
Ignore the bootstrap.php fille for PHPCS

This file uses both a require and a define, which is a no-no for phpcs.
Ignore the deprecated _displayHelp method when running phpcs
Require PHPCS to pass
Opening brace should be on the line after the declaration
Merge pull request #27 from cakephp/phpcs

Mostly PSR-2 compliant