Add info about supported Maven version for site.

  - Also using <kbd/> instead of <pre/> for user input as demonstrated by:
  http://getbootstrap.com/css/#code-user-input


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1618423 13f79535-47bb-0310-9956-ffa450edef68
Rename manual page to add Velocity support.


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1618425 13f79535-47bb-0310-9956-ffa450edef68
Add more information to NoSQL manual page.


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1618426 13f79535-47bb-0310-9956-ffa450edef68
Rename page to gain Velocity support.


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1618428 13f79535-47bb-0310-9956-ffa450edef68
Fix version numbers in Flume Appender manual.


git-svn-id: https://svn.apache.org/repos/asf/logging/log4j/log4j2/trunk@1618430 13f79535-47bb-0310-9956-ffa450edef68