Update to Gradle 5.0

[rwinch]

Summary

Gradle 5.0 was released. We should update to it

[dbuos]

I like to work on this issue :)

[dbuos]

@rwinch I made the change in the gradlew version, but I have some problems with compileJavaAspect task:

Some problems were found with the configuration of task ':spring-security-aspects:compileJavaAspect'.
> No value has been specified for property 'options.extensionDirs'.
> No value has been specified for property 'options.encoding'.
> No value has been specified for property 'options.debugOptions.debugLevel'.
> No value has been specified for property 'options.forkOptions.executable'.

I'll proceed to investigate this further

[dbuos]

@rwinch I got the build to work to some extend by filter these null properties as pointed in this issue but it's now failing because of a not existent file reference in spring-security-config.gradle

test {
	inputs.file file("$rootDir/docs/manual/src/docbook/appendix-namespace.xml")
}

After removal of that reference the build is now working.I don't know if I'm missing something related to this file.

[rwinch]

@dbuos Thanks for the fix. This was a legacy file that was being used in the tests that is no longer there as we moved to asciidoctor.