POM Modernization

- Corrected maven xsd
- Removed duplication in child poms (url, license, version, groupId)
- Removed commented out scala items
- Removed commented out jetty servlet api
- Removed excess spacing
- Note JavaSE-1.6 & 1.6 oracle docs
- Replaced examples use of antrun with maven-dependency-plugin
- Updated plugin versions
- Added plugins in parent pluginManagement
- Updated mockito & log4j
- Dropped old slf4j-api 1.5.10 - pom pulls latest
- Moved modelVersion to correct location
- Explicit groupId everywhere
- Use maven properties for jdk version used for compiler plugin
- Added generation of test source & javadoc jars
- Added lifecycle mapping filter for gmaven for users without m2e configuration.
- Moved maven bundle to plugin management

Allow specifying time zone in TimeBasedRollingPolicy's fileNamePattern

LOGBACK-611

This reverts commit 495929dc.

parent.relativePath was being set to the default value unnecessarily.

Added note for thread naming -- from Mikhail Mazursky (PR #187)

Set thread name

Reverted parent version from 1.2.0 to 1.1.3 for now.

ShutdownHook Configuration  Element

context via a shutdown hook. Enabled via the shutdownHook configuration
element (backed by the Joran ShutdownHookAction). 

Basic implementation provided, DelayingShutdownHook, stops the Logback
context after a specified delay (default is 0 for immediate shutdown).

Updated news page under revision 1.1.3 and added details to the
configuration manual page.

It is much easier to identify threads in thread dumps when they have meaningful names

Use ServiceLoader pattern to control logback bootstrap process

Configurable worker thread join timeout in AsyncAppenderBase

timeout instead of the default 1000ms. Added unit test to verify correct
function and updated appenders documentation describing new
configuration parameter and suggested uses. Added to news page under
release 1.1.3. 

Documentation, Unit Testing included.