Add line_after_use fixer

Replaces #816
Implements #153 


The joys of non-native english speakers :) will update that

2014-12-16 0:21 GMT+01:00 Graham Campbell <notifications@github.com>:
>
> In Symfony/CS/Fixer/PSR2/LineAfterUseFixer.php
> <https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/860#discussion-diff-21866214>
> :
>
> > +                $nextToken = $tokens[$insertIndex];
> > +                $nextToken->setContent($newline.$indent.ltrim($nextToken->getContent()));
> > +            } else {
> > +                $tokens->insertAt($insertIndex, new Token(array(T_WHITESPACE, $newline.$indent)));
> > +            }
> > +        }
> > +
> > +        return $tokens->generateCode();
> > +    }
> > +
> > +    /**
> > +     * {@inheritdoc}
> > +     */
> > +    public function getDescription()
> > +    {
> > +        return 'Each namespace use MUST go on it\'s own line and there MUST be one blank line after the use statements block.';
>
> its own line, not "it's".
>
> —
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> <https://github.com/FriendsOfPHP/PHP-CS-Fixer/pull/860/files#r21866214>.
>