add delete csar to ui, refs #26

 * added deleteCsar method to csar bean
 * added button to index.xhtml

WARNING: This is a broken state!
Only the first CSAR is deletable, deleting other csars fails without error
fix csarFile download
minor ui changes for delete, refs #26
Merge pull request #68 from Nik101010/26

UI for delete CSAR fixes #26