Removing bdgformats dependecy to use adam version

I want to remove the explicit dependency on this. I can't think of a reason that this shouldn't match the transitive depdency ADAM brings and being able to set them to different versions can create errors

Example I ran into, when bdg-formats was set to 0.3.2 and ADAM was 14.1-SNAPSHOT (which just upgraded from 0.3.2 to 0.4.0
```
java.lang.NoSuchMethodError: org.bdgenomics.formats.avro.Contig.getContigName()Ljava/lang/String;
        at org.bdgenomics.adam.models.ReferencePosition$.apply(ReferencePosition.scala:213)
        at org.bdgenomics.adam.models.VariantContext.<init>(VariantContext.scala:90)
```