Make joomlatools-console home configurable

[Hermsi1337]

Describe your environment

• OS: Linux
• Joomla version: 3
• Joomlatools Console version: v1.5.6
• Are you working on the Joomlatools Vagrant box: no

Describe the problem:

The joomlatools-console determines it's home directory by using the pre-defined $HOME variable, which is okay in most cases.
In our case, we're running the console in a managed-hosting environment, where the $HOME-directory is NOT writable, which results in an error when running the joomla command.

It would be great, if there is a way to configure the home directory for joomlatools-console by using a variable equivalent to COMPOSER_HOME. Maybe JOOMLATOOLS_CONSOLE_HOME?

I'm thinking about adjusting the getConsoleHome()-function like that:

    /**
     * Get the home directory path
     *
     * @return string Path to the Joomlatools Console home directory
     */
    public function getConsoleHome()
    {
        $home = getenv('HOME');
        if (getenv("JOOMLATOOLS_CONSOLE_HOME") !== "") {
            $home = getenv("JOOMLATOOLS_CONSOLE_HOME");
        }
        return rtrim($home, '/') . '/.joomlatools/console';
    }

Doing it that way we should also ensure backwards-comaptibility.
Since I'm not very familiar with best-practice-php-programming I'm open for suggestions.

Steps to reproduce:

1. Install joomlatools-console to a managed-hosting environment, e.g. mittwald
2. Run any command

Observed Results:

• Error: /path/to/home is not writable

Expected Results:

• That it's possible to override the default home for joomlatools-console.

[stevenrombauts]

@Hermsi1337 This is a great suggestion and would make a lot of sense to be able to overwrite the default HOME directory. The fix you suggest should work great! Feel free to send that in as a PR.