Document Gradle proxy configuration

Previously, users trying to build the test applications behind a proxy
were required to figure out the proper Gradle configuration on their
own.  This change adds concise documentation to the README.md and a
link to more in-depth documentation elsewhere.

[#68344122][resources #45]
Merge 68344122-gradle-proxy-configuration to master

[Completes #68344122]
Upgrade to Spring Boot 1.0.0.RELEASE

This change updates the test applications to use Spring Boot
1.0.0.RELEASE.
dist-zip application

This change adds a distZip style application to the collection of test
applications.  It is effectively the java-main-application but with a
distZip created as the final artifact.

[#69255612]
Merge 69255612-dist-zip-app to master

[Completes #69255612]
Main class name

Previously, the dist-zip-application would not run from scratch.  This
change adds an explicit main class name so that it will.
Ratpack upgrade

This change upgrades Ratpack to 0.9.3.
DataSource URL Typo

Previously the README contained a typo in the URL to find out the
DataSource URL.  This change fixes it.

[resolves #10]
Merge branch 'datasource-url-typo'
Handle FakeMongoDbFactory correctly

Previously, if the MongoDB URL was requested, but the MongoDB had not
been reconfigured it would result in an NPE.  During testing, we never
called for the URL in that case, but either way it's not a good
result.  This change protects against that possibility and returns an
dummy string for the URL in the case where the MongoDB has not been
reconfigured.

[resolves #9]
Version Upgrades

This change upgrades many of the versions used by the test
applications.  It also makes a change to the Groovy application so
that it works with Groovy 2.3.0.

[#70564266]
Merge 70564266-upgrade-versions to master

[Completes #70564266]
IntelliJ Artifact updates

This change updates the IntelliJ artifacts