Add bitbucket key/secret fields.
Add bitbucket signin button.
Add bitbucket_id.
Add bitbucket oauth.
Fix code style.
Merge with gae-init-auth.
Replace bitbucket_id by auth_id.
Merge branch 'master' of github.com:gae-init/gae-init-auth into bitbucket_oauth
Added bitbucket profile icon.
Alphabetically auth icons.
Format code - remove blank lines.
Fix PEP8 E501
Merge pull request #3 from gmist/bitbucket_oauth

Bitbucket oauth