Use PHP 5.4 syntax for PhpArray writer if > 5.4
Added toggle config for short array syntax
Dash to underscore keys
Merge pull request #6 from spiffyjr/feature/writer-syntax

Use PHP 5.4 syntax for PhpArray writer if > 5.4
[#6] CS fixes

- function declaration
Merge branch 'hotfix/6'

Close #6