(cherry picked from commit dca7a4b7)

This solves #127

(cherry picked from commit 8ebb4c9f)

 return empty array for multiple operands when no default value is given

This solves #119 and #124

This fails in #124

(cherry picked from commit 325f3c95)

update documentation and add simple language change to `GetOpt`

Various grammar/syntax, rewording and formatting changes.

remove help templates and implement reusable methods instead

# Conflicts:
#	resources/commands.php
#	test/Help/optionsTemplate.php

use magic getter for easier access to attributes

Added PHP 7.2 to test matrix

Fixed helpTextWithCustomScriptName test failing on Windows

On Windows the code emitted CRLF but the test was expecting only LF. It
seems the code changes the line-ending character depending on the
platform. However, I don't know if the error is in the application or the
test.

iterate over any value that is not null (solves #93)

add update documentation for version 3

Review and proposed changes on PR #89