short syntax for assertions

[jubianchi]

See atoum/atoum#384

<?php

namespace tests\units;

use atoum;

class stdClass extends atoum
{
    public function testFoo()
    {
        $this
            ->variable('foo')->{'=='}('foo')
            ->variable('foo')->{'!='}('bar')

            ->object($this->newInstance)->{'=='}($this->newInstance)
            ->object($this->newInstance)->{'!='}(new \exception)
            ->object($this->newTestedInstance)->{'==='}($this->testedInstance)
            ->object($this->newTestedInstance)->{'!=='}($this->newTestedInstance)

            ->integer(rand(0, 10))->{'<'}(11)
            ->integer(rand(0, 10))->{'<='}(10)
            ->integer(rand(0, 10))->{'>'}(-1)
            ->integer(rand(0, 10))->{'>='}(0)
        ;
    }
}

[Grummfy]

see source/en/asserters/ztips.inc.rst add some explanation about it