Fix NullPointerException in CodeCompletionProvider and HyperlinkProvider #20
Add default config option #19

[Description]
- We can set source code of config.php to the Options.
- This is used when new project is created.
- This option is invalid with default. We have to check it if we want to use it.
Check null for FileObject
Add branching for default config to ModuleExtender #19

[Description]
- Overwrite config.php if default config option is valid.
Add FuelPhpSaveAsDefaultConfigAction #19

[Description]
- This action is able to set current project config.php to the Options.