v4.4.3-rc1

Support appoptics-bindings@5

• add domainPrefix support
• add custom transaction name support
• add isReadyToSample function

Update documentation

• move from yuidoc to jsdoc via jsdoc2md
• provide more examples in api doc

Breaking changes from previous v4.3.2-beta release

• log.force has been removed
• enabled now defaults to true in options arg to instrument or startOrContinueTrace
• some testing may require setting APPOPTICS_TOKEN_BUCKET_* environment variables.