Closes gh-1565

Closes gh-1671

Closes gh-1660

* velo-preferfsa-property:
  Add VelocityProperties.preferFilesystemAccess

Update VelocityProperties to include a preferFilesystemAccess attribute.

Fixes gh-1652

(Cherry picked from commit bebbe92f)
Fixes gh-1633

Conflicts:
	spring-boot-actuator/src/main/java/org/springframework/boot/actuate/metrics/repository/redis/RedisMetricRepository.java

Conflicts:
	spring-boot-dependencies/pom.xml

Closes gh-1474

In addition to requiring the Servlet API to be on the classpath,
MetricFilter requires spring-web to also be on the classpath as it
extends OncePerRequestFilter. This commit updates the auto-configuration
for MetricFilter so that it will be disabled in the absence of a 
dependency on spring-web.

Fixes gh-1664

This commit introduces support for Jackson based XML serialization, using the
new MappingJackson2XmlHttpMessageConverter provided by Spring Framework
4.1. It is automatically activated when Jackson XML extension is detected on the
classpath.

Jackson2ObjectMapperBuilder is now used to create ObjectMapper and XmlMapper
instances with the following customized properties:
 - MapperFeature.DEFAULT_VIEW_INCLUSION is disabled
 - DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES is disabled

JodaModuleAutoConfiguration and Jsr310ModuleAutoConfiguration have been removed
since their behaviors are now handled directly by the ObjectMapper builder.

In addition to the existing @Bean of type ObjectMapper support, it is now
possible to customize Jackson based serialization properties by declaring
a @Bean of type Jackson2ObjectMapperBuilder.

Fixes gh-1237
Fixes gh-1580
Fixes gh-1644

* docs-grammar:
  Fix some grammar issues in docs

Otherwise we had to rely on afterPropertiesSet() being called to
validate and compute the prefix and key (which depend on each
other).

Some weird looking test failures led me to track this down.
If the user changes the prefix for metric names, he probably wanted
to change the keys as welll (otherwise 2 repositories can use the
same key, which is why the test was failing for me). We can do that
in an afterPropertiesSet().

This commit updates JndiJtaConfiguration to provide the same detection
algorithm as <tx:jta-transaction-manager>. If a native JTA transaction
manager exists for the current platform, it is used instead of the regular
JtaTransactionManager implementation.

Fixes gh-1576

Closes gh-1654

Jersey 2 has some Spring support built in but it's a bit awkward to
use in a Boot app, so autoconfiguration seems appropriate. The tests
and sample show how to use it, but the short story is that any
@Component can define JAX-RS endpoints via @GET etc.

There's a sample for Jersey 1 as well (pay careful attention to
the plugin configuration if you want to build an executable jar)

Fixes gh-1651

Previously JacksonAutoConfiguration and GsonAutoConfiguration were
not actually auto-configuration classes. They were only processed
due to being imported by HttpMessageConvertersAutoConfiguration.
In addition to being misleadingly named, this meant that they could
not be included or excluded individually and were also tightly coupled
to HTTP message conversion.

This commit updates spring.factories to make both
JacksonAutoConfiguration and GsonAutoConfiguration actual
auto-configuration classes. As a result, they can now be enabled or
disabled individually and are no longer coupled to HTTP message
conversion.

Closes gh-1562

This adds support for Hibernate 4.2 again by loading the specific
classes with reflection.

Fixes gh-1460, fixes gh-1557

Fixes gh-1635

Previously, the Gradle plugin’s ProjectLibraries produced a new library
for every file dependency, even if the dependencies where on the same
file. This would lead to a repackaging failure due to multiple
libraries having the same name.

This commit updates ProjectLibraries to treat file dependencies on the
same file as a single library, thereby resolving the name clash.

Fixes gh-1646

Closes gh-1595