Fix classpath for SparkTasklet

 - If classloader url.getFile() contains `!/` in the path, it gets appended to the spark classpath.
 - Split file path by removing the `!/` pattern
Add Test Env. Variable; Remove Bogus Test File

Spring Integration components that create messages require
a `BeanFactory` to get access to the configured `MessageBuilderFactory`.

An environment variable `SI_FATAL_WHEN_NO_BEANFACTORY` helps developers
by treating a missing bean factory as fatal.

Spring XD (particularly in message bus implementations) programmatically
creates many SI components; we need to ensure such components get a bean
factory.

Set the environment variable when running test cases.

This has the (unfortunate) side effect of requiring a bean factory
for components created programmatically in test cases. In this case
simply inject `mock(BeanFactory.class)`.

Also remove an invalid test class from `spring-xd-hadoop`.
XD-2203 Make sure Spring XD's PDF reference doc has right release revision references

* Add `appversion` attribute under the `asciidoctorDocbook` Gradle task
* Update `asciidoctor-gradle-plugin` to `1.5.0`
* Update `docbook-reference-plugin` to `0.3.0`
* Add `compat-mode` attribute under the `asciidoctorDocbook` Gradle task
* Add `compat-mode` attribute under the `asciidoctorHtml` Gradle task
WebUI: Fix execution detail status class
  - The anchor link needs to use the corresponding class attribute from ng-class
based on the execution status exit code.
Update servers.yml to enable JMX by default

Add section to uncomment to enable shutdown in the UI
XD-2344 WebUI: quote parameters with space

* Added a check that wraps the parameter value into quotes ONLY IF the string contains a whitespace (incl. tab charater)
Release version 1.1.0.M1
XD-2352: Placeholder in classname was failing