Release 0.7.0

Breaking changes

• Removed ElasticApm.startSpan. Spans can now only be created from their transactions via Transaction#createSpan.
• ElasticApm.startTransaction and Transaction#createSpan don't activate the transaction and spans
  and are thus not available via ElasticApm.activeTransaction and ElasticApm.activeSpan.

Features

• Public API
  • Add Span#captureException and Transaction#captureException to public API.
    ElasticApm.captureException is deprecated now. Use ElasticApm.currentSpan().captureException(exception) instead.
  • Added Transaction.getId and Span.getId methods
• Added support for async servlet requests
• Added support for Payara/Glassfish
• Incubating support for Apache HttpClient
• Support for Spring RestTemplate
• Added configuration options use_path_as_transaction_name and url_groups,
  which allow to use the URL path as the transaction name.
  As that could contain path parameters, like /user/$userId however,
  You can set the url_groups option to define a wildcard pattern, like /user/*,
  to group those paths together.
  This is especially helpful when using an unsupported Servlet API-based framework.
• Support duration suffixes (ms, s and m) for duration configuration options.
  Not using the duration suffix logs out a deprecation warning and will not be supported in future versions.
• Add ability to add multiple APM server URLs, which enables client-side load balancing.
  The configuration option server_url has been renamed to server_urls to reflect this change.
  However, server_url still works for backwards compatibility.
• The configuration option service_name is now optional.
  It defaults to the main class name,
  the name of the executed jar file (removing the version number),
  or the application server name (for example tomcat-application).
  In a lot of cases,
  you will still want to set the service_name explicitly.
  But it helps getting started and seeing data easier,
  as there are no required configuration options anymore.
  In the future we will most likely determine more useful application names for Servlet API-based applications.