Adding php-standalone and php-symfony, which we're using as an experiment in the form component to doc usage differences

Along with this, the `conf.py` file will need the following 2 lines added:

lexers['php-standalone'] = PhpLexer(startinline=True)
lexers['php-symfony'] = PhpLexer(startinline=True)
Merge pull request #3 from weaverryan/php-component-framework-block

Adding php-standalone and php-symfony