Bitbucket Server Committer Avatar is using the default avatar

Summary:

In the development panel, the committer avatar is shown as the default avatar regardless of the user avatar at Bitbucket Server side.

Steps to Reproduce:

• Integrate JIRA with Bitbucket Server.
• Create a repo and make a commit with its commit message including an issue key on JIRA side.
• Let Bitbucket Server capture the commit.
• Create a user that uses the same email address as the committer, then specify a unique avatar.
• Navigate to the mentioned issue key in JIRA.
• Click the "Commits" link in the Development Panel.

Expected Result:

• As how bitbucket have mapped the committer account to Bitbucket Server account, the Avatar will be shown.

Actual Result:

• JIRA will still show the default Anonymous avatar beside the commits.

Notes:

• Tested in JIRA 7.1.0 and Bitbucket Server 4.1.0
• Tested with FerCru 4.0.3 and the avatar is shown when the committer is mapped with FerCru user.