Fix error which occur after fresh installation of SyliusStandard

 ```
request.CRITICAL: Uncaught PHP Exception Twig_Error_Syntax: "An exception has been thrown during the compilation of a template ("You must add CmfCreateBundle to the assetic.bundle config to use the {% stylesheets %} tag in CmfCreateBundle::includecssfiles.html.twig. (currently enabled: SyliusWebBundle)") 
```
Try to avoid composer memory error on travis.
Merge pull request #44 from l3l0/patch-1

Fix configruation error which occur after fresh installation of Sylius-Standard