fix typo on bootstrap option

using undefined variable $option causes Warning: Illegal string offset 'bootstrap'
Added missing use statements

Fixes #134
Generate ".{format}" instead of ".json" suffix when using the commandline.

This causes swagger-ui to hide the extension.
Fixes #128
Build 0.9.1
Fix for php 5.5 style class name resolution (ClassName::class)
Build 0.9.2