Upgrade to Groovy 2.3.0-rc-2
Remove remnants of Couchbase starter
Add generic error handling to BasicErrorController

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
Move ErrorController to autoconfig
@WebApplication->@WebAppConfiguration

Fixed gh-746
Add FreeMarker support

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
Polish spring-boot-starter-data-gemfire's pom
Replace column name using reserved keyword

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
Upgrade to Reactor 1.1

Fixes gh-706
Add support for HikariDataSource

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
Convert actuator-ui sample to FreeMarker

See gh-679
Make `loader` Windows compatible

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
Minor improvement in simple sample test
Add more runtime metrics like information about heap, class loading and threads to the metrics infrastructure
Add URLs from parent classloader in executable jar

$ (cd spring-boot-tools; mvn clean install -DskipTests=true)
$ (cd spring-boot-samples/spring-boot-sample-simple/; mvn clean package)
$ java -jar spring-boot-samples/spring-boot-sample-simple/target/spring-boot-sample-simple-1.1.0.BUILD-SNAPSHOT.jar

(vanilla executable jar archive: works)

$ java -cp spring-boot-samples/spring-boot-sample-simple/target/spring-boot-sample-simple-1.1.0.BUILD-SNAPSHOT.jar:spring-boot-tools/spring-boot-loader/src/test/resources/jars/app.jar org.springframework.boot.loader.JarLauncher

(jar archive plus vanilla plugin: works)

$ (cd spring-boot-samples/spring-boot-sample-simple/target; rm -rf app && mkdir $_ && cd $_ && jar -xf ../*.jar)
$ java -cp spring-boot-samples/spring-boot-sample-simple/target/app/ org.springframework.boot.loader.JarLauncher

(exploded directory: works)

$ java -cp spring-boot-tools/spring-boot-loader/s:spring-boot-tools/spring-boot-loader/src/test/resources/jars/app.jar org.springframework.boot.loader.JarLauncher

(exploded directory with plugin jar: works)

Potential fix for gh-529
Fix build

Two modules are still relying on the spring-boot test-jar but it was
not generated anymore. Adding the generation of test-jar again as
a workaround until we completely removes the use of it.
Add messagecode resolver format based on application property
Use enum for MessageCodesResolver format

Fixes gh-670
Add support for custom banner

SpringApplication now picks up a classpath:banner.txt
by default, and user can choose a different one with
banner.location. The encoding is banner.encoding.

Fixes gh-458
Prevent duplicate files from getting onto sources