Add rollback to the travis checks

[Quetzacoalt91]

Restorations have been reported as broken on 1.7.

We add the process on Travis to certify it will still work in the future, then we fix the potential issues.

• Add on Travis
• Fix potential issues

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This change is 

[eternoendless]

Reviewed 9 of 9 files at r2.
Reviewable status: all files reviewed, 4 unresolved discussions (waiting on @Quetzacoalt91)

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cli-rollback.php, line 27 at r2 (raw file):

 *  International Registered Trademark & Property of PrestaShop SA
 */

How about adding a little description here?

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cli-rollback.php, line 31 at r2 (raw file):

$container = autoupgrade_init_container(dirname(__FILE__));

if (php_sapi_name() !== 'cli') {

Maybe this should be done before anything else?

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classes/TaskRunner/ChainedTasks.php, line 40 at r2 (raw file):

    protected $step;

    public function run()

Missing phpdoc (I'm guessing it returns a status code where 0 == success)

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classes/TaskRunner/ChainedTasks.php, line 66 at r2 (raw file):

    public function setOptions(array $options)
    {
    }

This method should be abstract, be removed, or do something

[Quetzacoalt91]

Done, thanks @eternoendless.

For the next reviews can you please use GitHub? The diffs shouldn't be too complex on this repository.

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