add random GET argument for imageUrl faker

[Nicals]

When using multiple imageUrl with same configuration, only one image is loaded from lorempixel since the generated url are the same.

This pull requests adds an argument to tell Faker to add a random GET parameter to the generated url in order to have different images from lorempixel.

[ronanguilloux]

Some Travis-CI trouble may be involved here :

Travis' output mentioned some temporary network-related error:

php5.4:

[Composer\Downloader\TransportException]                                     
  The "https://getcomposer.org/version" file could not be downloaded: php_net  
  work_getaddresses: getaddrinfo failed: Temporary failure in name resolution  
  failed to open stream: php_network_getaddresses: getaddrinfo failed: Tempor  
  ary failure in name resolution

hhvm:

[Composer\Downloader\TransportException]                                     
  The "https://getcomposer.org/version" file could not be downloaded: Failed   
  to open https://getcomposer.org/version (Couldn't resolve host 'getcomposer  
  .org') 

Maybe @Nicals shall try a new test commit to force Travis-ci to check this PR again ?

[fzaninotto]

I don't understand. LoremPixel returns always a different image, even when called with the same URI. Can you provide a failing test to demonstrate your problem?

[Anahkiasen]

No it won't, not during the same pageload. If you hit 5 times the same URL in a single page it'll display 5 times the same, and if you refresh 5 times a new one.

[Nicals]

Ok, forgot about this pull request. It now passes as Travis network don't suck anymore.

[fzaninotto]

Now I understand, but why only 5? It doesn't make sense to me.

[Nicals]

I don't understand the problem. Only 5 what ?

All is done in this patch is add a 5 digits random GET argument to the image url in order to have different images within the same web page instead of multiple time the same one.

[fzaninotto]

My bad, I'm mixing up randomNumber and numberBetween.

I'm ok with the patch, could you just modify the README accordingly? Does it make sense to make the $randomize parameter default to true?

[Nicals]

I think it doesn't make sense to make the $randomize true. Different images mean more client resources loading time. On large page, I would prefer a small number of images. So the default configuration to false is IMHO preferable.

I also think it's better to set it to False so that existing Faked program would have the same behaviour when the developer updates the Faker lib. Not a big deal on such an option, I know, but I think it's preferable. Adding feature is a good think, but it shouldn't alter existing code.

[fzaninotto]

I don't agree. Users expect the provider to return real random data, the fact that the same image appears several times on a given page is seen as a bug (even by me).

[fzaninotto]

Superseded by #494

[fzaninotto]

Merged in the other PR, thanks for your contribution!