Remove mention of managed commands in manual.
AsyncAppender now flushes log events when the application shuts down

* async appender workers are no longer daemon threads so they can flush
  partially buffered events to their delegates before stopping
* SLF4J request log stops the appenders when it's closed
* configured command stops the appenders when the execution finishes
* configured commands that execute asynchronously (e.g. ServerCommand)
  must now call cleanup when they finish execution
Merge pull request #414 from vadims/async_appender

AsyncAppender now flushes log events when the application shuts down
Add AbstractServerFactory#shutdownGracePeriod

We seemed to lose this option in the refactoring of 0.7. Jetty has
changed the way that shutdown is handled to better support multiple
lifecycles, but this still makes sense.
Upgraded to Guava 16.0.1.
Update example SPDY references for 0.7
Merge pull request #457 from joschi/guava-16.0.1

Upgrade to Guava 16.0.1

Fixes critical bug preventing Guava's reflection utilities from operating properly under JDK 7u51: https://code.google.com/p/guava-libraries/issues/detail?id=1635
Merge pull request #458 from sps/master

Update example SPDY references for 0.7
Merge pull request #432 from Trundle/master

Remove mention of managed commands in manual.
Upgraded to Jackson 2.3.1.
Upgraded to argparse4j 0.4.3.
Upgraded to Liquibase 3.1.1.
Upgraded to JSR305 Annotations for Findbugs 2.0.3.
Upgraded to Jackson 2.3.1.
Upgraded to Logback 1.1.0.
Upgraded to H2 database 1.3.175.
Upgraded to Apache HttpClient 4.3.2.
Upgraded to tomcat-jdbc 7.0.50.
Upgraded to Hibernate 4.3.1.Final.
Merge pull request #449 from joschi/dependency-updates

Dependency updates