Support arrays as objects with basic methods

This commit allows invoking methods on JVM arrays: get, set, length and iterator.
toString on JVM arrays
equals on JVM arrays
asList on JVM arrays
Simplifying standard augmentations array accesses
Simplifying the echo-args sample
Simplifying another example
Documentation for JVM arrays viewed as objects

The documentation also comes with the occasional fix for code block
delimiters that have been shortened to 4 characters. This will improve
future asciidoctor compatibility.
Throw ArrayIndexOutOfBoundsException in next()
Merge pull request #21 from jponge/wip-arrays-as-objects

Deal with JVM arrays as objects