We can load fixtures implicitly (via the first load of entity fixture) or explicit now

| Bug fix                | no   |
| ----------------------| ------ |
| Feature addition | yes |
| Backwards compatibility break|  no |
| Symfony2 tests pass| yes |
| License of the code| MIT|
| Documentation PR| [here](https://github.com/rezzza/alice-extension/tree/default_loading_modes#advanced-fixtures)|