[WIP] Adopted template overriding from other actions like update

Currently when you use the `SyliusResourceBundle` standalone, when you want to override the template for the delete action you have to define it this way:

``` yaml
my_delete:
    pattern: /my/{id}
    methods: [DELETE]
    defaults:
        _controller: my.controller.my:deleteAction
        template: MyCoreBundle:My:delete.html.twig
```

This is inconsistent with the other actions. This PR changes this so that it works with the folloging syntax:

``` yaml
my_delete:
    pattern: /my/{id}
    methods: [DELETE]
    defaults:
        _controller: my.controller.my:deleteAction
        _sylius:
            template: MyCoreBundle:My:delete.html.twig
```

Before merging this PR we should reconfigure the routes so that `SyliusWebBundle:Backend/Misc:delete.html.twig` will be used again ;-)
Configured template for all delete actions
[omnipay] fix repository url in composer.lock
Fixed inventory UI
Revert "Add testing against HHVM at Travis-CI"

This reverts commit 71923cb0e24020f5366bf409d482fa69abdd2462.
Merge pull request #717 from wahler/issue-701

[omnipay] fix repository url in composer.lock
Merge pull request #720 from umpirsky/feature/fix-inventory-unit

Fixed inventory UI
Fixed SyliusCheckoutEvents
When no data is sent use default values for sorting labels
Merge pull request #727 from stloyd/bugfix/sorting_links

[ResourceBundle] When no data is sent use default values for sorting labels
Merge pull request #729 from umpirsky/fix/checkout-event-names

Fixed SyliusCheckoutEvents
Removed check for empty values
Change the way how Doctrine fixtures bundle is initialized & polish README file
Polish Behat DataContext file to improve performance
Use interface instead of entity in doctrine mappings
Moved backorders enabled to parameters.yml
Merge pull request #736 from stloyd/bugfix/issue-719

[CoreBunde] Use interface instead of entity in doctrine mappings
Update messages.ru.xlf

Add some missed translations for Russian language
Merge pull request #740 from falinsky/patch-1

Update messages.ru.xlf
[Frontend] Label class for out of stock message corrected