fix rename program bug
Merge branch 'development' of gh:Catrobat/Catty into development

* 'development' of gh:Catrobat/Catty:
  remove useless loop
  display featured image in downloads
  fix for not reloading when we received all data
  changed network defines
fixes #121 and disallow special chars for names
fixes #72 and #136
Merge remote-tracking branch 'origin/development' into development
remove image borders