Clean and align with changes in Spring Boot 1.2

Fixes gh-2104

Update the logging section to reflect changes in Spring Boot 1.2

Fixes gh-1790

Add a hint to show that the `configure` method is now optional.

Fixes gh-2074

Fixes gh-2103

Update JarCommand to only include nested libraries that are actually
zip files. Similar to commit 38585bf3 which introduced the same
functionality to the Repackager.

Fixes gh-2094

Fixes gh-2098

Fixes gh-2097

Fixes gh-2096

Fixes gh-2096

Call `context.getServletContext().setExtendedListenerTypes(true)` to
ensure that ServletContextListeners can be registered with Jetty 9.

Fixes gh-2058

flyway.init and flyway.target are two options that are missing from the
meta-data following the change in f0bc3c08. It turns out that both these
properties have an additional setter taking a String so they shouldn't be
excluded after all

Closes gh-2088

Fixes gh-2093

Closes gh-2038

Update DEFAULT_SESSION_TIMEOUT to use TimeUnit.MINUTES.toSeconds(30)
rather than TimeUnit.SECONDS.toMinutes(30) which would always return
0.

See gh-2084
(cherry picked from commit b33bbd56)

Update Rest, Hypermedia and HttpMessageConverter auto-configuration to
ensure beans are created in the correct order.

Prior to this commit the MappingJackson2HttpMessageConverter bean would
not be created because Spring Data Rest's TypeConstrained versions had
already been registered.

Fixes gh-1729

Update DEFAULT_SESSION_TIMEOUT to use TimeUnit.MINUTES.toSeconds(30)
rather than TimeUnit.SECONDS.toMinutes(30) which would always return
0.

See gh-2084

Fixes gh-2091

This reverts commit 17631486.

Update SpringBootServletInitializer so that the WebApplicationContext is
not initialized until ServletContextListener.contextInitialized() is
called. This makes it easier to subclass SpringBootServletInitializer
to add additional listeners to be called in a specific order.

Fixes gh-2070

Define shell.ssh.port and shell.telnet.port as integer properties
so that the generated meta-data exposes the proper type.

Fixes gh-2076

Inject the ApplicationContext into Jackson2ObjectMapperBuilder to allow
Jackson handlers to be autowired. See SPR-10768.

Fixes gh-2081

Fixes gh-2088

Add `application.formatted-version` and `spring-boot.formatted-version`
properties for use in banner.txt files. The `application.version` and
`spring-boot.version` properties now return a simple version number
without any formatting.

Fixes gh-2090

Assume that Undertow uses -1 for "no expiry".

See gh-2084

Conflicts:
	spring-boot/src/main/java/org/springframework/boot/context/embedded/jetty/JettyEmbeddedServletContainerFactory.java

Update AbstractConfigurableEmbeddedServletContainer to set the default
session timeout to 30 minutes. Also correct Javadoc to specify that
the default is '30 minutes'.

Fixes gh-2084

Add a tip for both the Maven and Gradle "Packaging executable jar and
war files" section referring to the how-to.

Fixes gh-2086

See gh-2080

Revert commit 3ad43e0d to give us
a little more time to consider how this will impact tooling.