Add public_path configuration options
* Refactor theme pass to make use of public_path
Change public_path configuration option to relative web path
* Replace getThemePath and getPublicThemePath with resolveThemePath method
Remove deprecated config/routing.yml and config/services.yml
* Remove extension load method body (no configuration to load)
Fix doc comments
Refactor process method and fix php cs
* Add getExtensionConfiguration method
Add version 0.9.0
* More refactoring to theme compiler pass
* New methods: parseImports, getRelativeRootPath, getRelativeBootstrapPath
* Update readme