When logging.level.* is set in external configuration they can now
contain placeholders.

Fixes gh-1680

Closes gh-1435

Previously, RepositoryRestMvcBootConfiguration was not annotated with
@Configuration. This meant that it was processed in lite mode.
Crucially, in lite mode, there’s no proxying so each call to the
config() @Bean method from within other @Bean methods resulted in the
creation of a new RepositoryRestConfiguration instance. Furthermore, as
each of these instances wasn’t a Spring bean the configuration
properties were not applied.

This commit updates RepositoryRestMvcBootConfiguration to annotate it
with @Configuration so that it’s no longer processed in lite mode. It
also updates the unit tests and the Spring Data REST sample to verify
that the baseUri can be configured using application.properties.

Fixes gh-1675

Previously, for a string to be considered upper-case,
EmbeddedServerPortFileWriter required every character in the
string to be upper-case. This meant that strings containing numbers were
considered lower-case even if every letter in the string was upper-case.
OS X’s case-preserving, case-insensitive file system masked this problem
as the tests were still able to find the created file, even though the
case of its name was not as expected.

This commit updates EmbeddedServerPortFileWriter to only require
characters that are letters (as defined by Character.isLetter()) to be
upper-case. It also updates the tests to verify that the case of the
created file’s name is correct in such a way that it will fail, even
on OS X, when it is not.

Fixes gh-1676

Points to note for authors:

* Nesting "*" in `literals` does not behave like Markdown - you have to
escape the asterisk (e.g. `foo/\*`)

* Quote ligatures (why we had to use those I don't really know) are
different in asciidoctor 1.5 ('`foo`' instead of ``foo'')

Merge branch '1.1.x'

Conflicts:
	spring-boot-docs/src/main/asciidoc/production-ready-features.adoc
	spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

Add a EmbeddedServerPortFileWriter which can be used to write server
port information to a file.

Fixes gh-1275
Closes gh-1491

Rename ApplicationPidListener to ApplicationPidFileWriter (keeping the
old class in a deprecated form)

Fixes gh-1673

* spring-boot-1499:
  Add CAMELCASE_TO_HYPHEN in RelaxedNames

Fixes gh-1499

* spring-boot-545:
  Support Jetty HandlerCollection types

Update JettyEmbeddedServletContainer to support HandlerCollection types
in addition to HandlerWrappers.

Fixes gh-545
Closes gh-1597

* spring-boot-amq-mqtt:
  Add ActiveMQ MQTT connection URL auto-detection

Fixes gh-1638

 - Supply auto-configuration for the new indicator
 - As suggested in the pull request, include the free disk space and
   configured threshold in the health details
 - Update the documentation to describe the indicator and its
   two configuration settings
 - Use @ConfigurationProperties to bind the indicator's configuration.
   This should make the changes sympathetic to the work being done
   to automate the configuration properties documentation

Closes gh-1297

See gh-1297

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