Post-commit review request creation is now enabled for the BitBucket

hosting service. The BitBucket hosting service class is now able to

fetch lists of branches, lists of change metadata, and individual diffs

from the BitBucket API.
BitBucket's API does not support fetching files by their blob IDs and

the base_commit_id parameter (which indicates the commit ID of the

revision we want the file at) must be used. This field was added to the

reviewboard.scmtools.core.Commit class so that it could be used when

fetching commits from the API and to create review requests. Without

this parameter, review request creation will fail (as all file

existence checks will fail).

Added a BitBucket hosted repository on my development server. I was

able to create post-commit review requests.