Add alternative domain option to file and image polymod fields objects
Add option to set an alternative domain for standard module files and image ressources
Update blockimage and blockfile to use the new alternative domain parameter
Fix a regression introduced by commit 838f7b0d558b40d3ae7f6a27fe8a0772a3f850b3
Made the new alternative domain available in polymod templates
Merge pull request #53 from automne-cms/alternative-domain

Alternative domain