Adding blog post about Krakow SWC
Removing tabs
Added John Blischak to June DSSG and July Notre Dame boot camps.
Merge pull request #575 from jdblischak/add-jdb-as-instructor

Added John Blischak to June DSSG and July Notre Dame boot camps.
Merge pull request #572 from apawlik/master

Adding blog post about Krakow SWC
Updating Krakow blog post and adding JU to metadata