Add more runtime metrics like information about heap, class loading and threads to the metrics infrastructure

The encoding of UTF-8 (et al.) chars in the
JarUrlConnection has to be made explicit, otherwise
Wdinows apparently does not pick the default(?).

Fixes gh-711, Fixes gh-753

See gh-679

We still prefer Tomcat if it is available (that can change
if the community asks loudly enough). Hikari is supported
via the same spring.datasource.* properties as Tomcat (and
DBCP), with some modifications:

* The validation and timeout settings are not as fine-grained
in Hikari, so many of them will simply be ignored. The most
common options (url, username, password, driverClassName) all
work as expected.

* The Hikari team recommends using a vendor-specific DataSource
via spring.datasource.dataSourceClassName and supplying it with
Properties (spring.datasource.hikari.*).

Hikari prefers the JDBC4 isValid() API (encapsulates vendor-
specific queries) which is probably a good thing, but we
haven't provided any explicit support or testing for that yet.

Fixes gh-418

Fixes gh-706

This commit replaces the "index" property of Review to use a custom
column name ("idx") as index is a reserved keyword in some RDMS such
as Oracle and MySQL.

Fixes gh-752

This commit adds auto-configuration and a starter,
spring-boot-starter-freemarker, for using FreeMarker view templates in
a web application.

A new abstraction, TemplateAvailabilityProvider, has been introduced.
This decouples ErrorMvcAutoConfiguration from the various view
technologies that Spring Boot now supports, allowing it to determine
when a custom error template is provided without knowing the details of
each view technology.

Closes #679

Fixed gh-746

Since Spring supports gobal error handling through
@ControllerAdvice, it is quite easy to set up more meta-data
about an exception for the BasicErrorController. You need
to be careful not to swallow Security exceptions, and probably
others (optionally) so this feature needs a bit more work.

See gh-538

Salvatore has indicated that Jedis is his Java Redis client of choice.
This commit updates the auto-configuration support, actuator and
Redis starter accordingly.

Completes #745

 - Consistent use of tabs
 - Consistent ordering

Fixes gh-606

... as well as a Spring Boot Sample Application with associated tests
for demonstrating how to get started using both Spring Data GemFire
and GemFire.

Fixes gh-631

Reverting arguments in assertEquals where constant was placed on
the "actual" place. Replacing assertEquals with assertFalse, assertTrue
and assertNull where applicable.

Fixes gh-735

Fixes gh-617

Conflicts:

	spring-boot-docs/src/main/asciidoc/spring-boot-features.adoc

For some reason the exception mappings are only created with the
publisher is initialized in the constructor of DefaultAuthenticationEventPublisher.
Changed SpringBootWebSecurityConfiguration to do that rather then
relying on the ApplicationEventPublisherAware behaviour to inject it.

Fixes gh-719

The username/password option stil lonly works for a single host (to
connect to a cluster I suspect you need to set the URI). Also added
a MongoClientOptions (if a bean of that type exists it will be
used to populate the options that aren't in the URI).

Fixed gh-536

Rename MongoTemplateAutoConfiguration to MongoDataAutoConfiguration
since it now configures more than just the template.

Restore formatting and fixup doc comments.

Polish couchbase support to:
- Extract properties into its own class
- Remove unnecessary inner configuration class
- Add since tags
- Format code and add `this.` references

Polish MultipartConfigElement changes introduced in commit e8e59ea6
as follows:

- Fix javadoc formatting
- Fix tab/spaces formatting
- Fix asciidoc formatting
- Move creation of MultipartConfigElement into MultipartProperties
- Add @Since tags
- Restore random port in tests

* modifier-order:
  minor - correcting modifiers order

Conflicts:
	spring-boot-starters/spring-boot-starter-parent/pom.xml