Merge pull request #370 from sescandell/master

[Features] Form theme add is now mandatory
Cookbook in table of contents
Fix embed generator path for unix systems
Pass model name to getModelPrimaryKey to prevent "call on a non-object" error.
Merge branch 'master' of https://github.com/symfony2admingenerator/AdmingeneratorGeneratorBundle into additional_parameters
Create .scrutinizer.yml
Update .scrutinizer.yml
Update .scrutinizer.yml
Update .scrutinizer.yml
Remove null default value in NewBuilderAction template on getAdditionalRenderParameters function
Add documentation
Merge branch 'master' of https://github.com/symfony2admingenerator/AdmingeneratorGeneratorBundle into additional_parameters