Consider supporting gradle run task

[lread]

In my dabblings with AsciidoctorJ, I have found it convenient to use the gradle run task.

I'm not sure if this is generally useful, or even appropriate - but if so, it only requires a few lines of gradle.

To demonstrate what this looks like, I'll run the asciidoctor's --help

./gradlew run --args="--help"

which, on my computer outputs:

> Configure project :
No Signatory configured for project asciidoctorj. Skip signing! See https://docs.gradle.org/current/userguide/signing_plugin.html
No Signatory configured for project asciidoctorj-api. Skip signing! See https://docs.gradle.org/current/userguide/signing_plugin.html
No Signatory configured for project asciidoctorj-arquillian-extension. Skip signing! See https://docs.gradle.org/current/userguide/signing_plugin.html
No Signatory configured for project asciidoctorj-distribution. Skip signing! See https://docs.gradle.org/current/userguide/signing_plugin.html
No Signatory configured for project asciidoctorj-test-support. Skip signing! See https://docs.gradle.org/current/userguide/signing_plugin.html

> Task :asciidoctorj-distribution:run
Usage: asciidoctor [options] input files; use - to read from STDIN
  Options:
    -a, --attribute
      a list of attributes, in the form key or key=value pair, to set on the 
      document 
      Default: []
    -b, --backend
      set output format backend (default: html5)
      Default: html5
    -B, --base-dir
      base directory containing the document and resources (default: directory 
      of source file)
    -cp, -classpath, --classpath
      add a directory to the classpath may be specified more than once
    -C, --compact
      compact the output by removing blank lines (default: false)
      Default: false
    -D, --destination-dir
      destination output directory (default: directory of source file)
    -d, --doctype
      document type to use when rendering output: [article, book, inline] 
      (default: article)
    -e, --eruby
      specify eRuby implementation to render built-in templates: [erb, erubis] 
      (default: erb)
      Default: erb
    -h, --help
      show this message
    -I, --load-path
      add a directory to the $LOAD_PATH may be specified more than once
    -s, --no-header-footer
      suppress output of header and footer (default: false)
      Default: false
    -o, --out-file
      output file (default: based on input file path); use - to output to 
      STDOUT 
    -q, --quiet
      suppress warnings (default: false)
      Default: false
    -r, --require
      require the specified library before executing the processor (using 
      require) 
    --safe
      set safe mode level to safe (default: unsafe)
      Default: false
    -S, --safe-mode
      set safe mode level explicitly: [unsafe, safe, server, secure] (default: 
      unsafe) 
      Default: UNSAFE
      Possible Values: [UNSAFE, SAFE, SERVER, SECURE]
    -n, --section-numbers
      auto-number section titles in the HTML backend; disabled by default
      Default: false
    -R, --source-dir
      source directory (requires destination directory)
    -T, --template-dir
      directory containing custom render templates the override the built-in 
      set 
    -E, --template-engine
      template engine to use for the custom render templates (loads gem on 
      demand) 
    -t, --timings
      enable timings mode (default: false)
      Default: false
    --trace
      include backtrace information on errors (default: false)
      Default: false
    -v, --verbose
      enable verbose mode (default: false)
      Default: false
    -V, --version
      display the version and runtime environment
      Default: false


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