Generator\Boolean
Use 'use Eris\TestTrait' in every PHPUnit test
Use 'then' instead of '__invoke'
Merge branch 'boolean_generator'
Cosmetic changes on Generator\Boolean
Merge pull request #15 from giorgiosironi/style

Style
Generator\Tuple first implementation
Use Generator\Tuple to implement Generator\Vector
Merge remote-tracking branch 'origin/tuple-generator'
Added end2end test for Generator\Tuple
Better detection of how many tests fails
Better shrinking using Tuple shrink