"serializer" blueprint should support different base classes

[Turbo87]

The "adapter" blueprint supports the --base-class option and automatically detects if an "application" adapter exists. IMHO the same logic should be reused for the "serializer" blueprint too.

[pangratz]

This is tackled in #4023. Can you chime in there? Currently the failing test for the serializer prevents that PR from being merged. I think the test is failing because the blueprint from ember-cli is used instead of the one provided in ember-data...

[Turbo87]

@pangratz thanks, didn't see that one

[pangratz]

Yeah, the title of that PR is not that descriptive 😔