Improved Bitbucket integration

We improved on a range of parameters in the Bitbucket integration available through the elmah.io App Store. More details are provided as part of the issues on Bitbucket, App password support, and better documentation.

Re-install any Bitbucket integrations you currently have and move over to App passwords as described here: https://docs.elmah.io/elmah-io-apps-bitbucket/.