Change toInteger behavior

Now returns the converted array (instead of returning void and converting
the argument passed as a reference.)

- Change test to reflect new behavior
- Change Framework usage (in Joomla\Form\Form)
Removing @package [ci skip] Closes #77
Merge branch 'master' into improve-array-helper

Conflicts:
	vendor/Joomla/Form/Form.php
	vendor/Joomla/Utilities/Tests/ArrayHelperTest.php
Code style cleaning

Fixing up (mostly) @since alignment.
Refactor usage of TestReflection

Closes #19
Get the form package working.
Merge branch 'improve-array-helper' of https://github.com/eirslett/joomla-framework into improve-array-helper
Remove the getInstance() method from Joomla\Filter\Input.