WELD-1717 Switching reference documentation to Asciidoc
Docbook is still used as an intermediary format (generated from AsciiDoc)
To provide PDF and HTML final doc similar to previous ones
WELD-1717 Corrected starting literal without space before 1st back quote
WELD-1716 Synchronize invalidation of expired conversations
WELD-1716 One more synchronization fix
WELD-1710 Servlet container support - fix detection in Jetty 9.2
- TomcatContainer - change the name of the  required class
- JettyContainer - add "servername" check
- allow to skip Container detection and define the Container class via
context-param
- update Tomcat and Jetty versions
Upgrade build-config to 6
Some warning fixes.
WELD-1713 Document additional configuration requirement for Jetty 8+
WELD-1720 Get rid of warnings in unit tests