CMS-2939 ContentWizard - PageTemplateComboBox in PageTemplateSelector must be filtered on the content types it can render

 Added GetPageTemplatesByCanRenderRequest, refactored PageTemplateSummaryLoader to accept template request as parameter.
Merge pull request #570 from enonic/CMS-2939

 CMS-2939 ContentWizard - PageTemplateComboBox in PageTemplateSelector m...