BucketsApiImpl.createBucket does not convey schemaType #572

Steps to reproduce:
List the minimal actions needed to reproduce the behavior.

1. issue a BucketsApi.createBucket request with a Bucket object having schemaType explicit
2. verify that the created bucket has schema type implicit

Expected behavior:

• Obviously one would expect the bucket to have explicit bucket schema type, not implicit

Actual behavior:

• The created bucket has implicit schema type

Problem lines of code

• BucketsApiImpl.createBucket does not correctly invoke PostBucketRequest.schemaType on the request object. (See code here.) So it is basically ignoring the schema type set on the Bucket object.