The callback option was not being honoured for Facades

This meant it was not possible to use an alias for a Facade in templates.

for example from the config (/rcrowe/twigbrige/extensions.php)
        'HTML' => ['is_safe' => true, 'callback'=> 'markup'],

Then in the template: {{ markup.whatever() }}
Save original name in the Bridge and normalize the name to remove the extension.
Merge pull request #155 from rcrowe/better-name

[WIP] Use original name
Merge pull request #144 from rikh42/patch-1

The callback option was not being honoured for Facades
Add note about model methods

See https://github.com/rcrowe/TwigBridge/commit/8ad1b509c966b286f923ac5087fd8bca1f539ebe#commitcomment-8386744
Merge branch 'master' of github.com:rcrowe/TwigBridge
fix tests for #157