Changed the server Gemfile, made ruby debugger and pry available in test env
Handle errors when updating interactives.

Validate that an interactive's title is unique within a group and is not empty.
Validate that an interactive's path exists. Create a client side error
dialog to display interactive update errors.
Choose an interactive group when saving an interactive
A user should be able to make copies of previously saved interactives.
Disabled interactive save until after interactive has been updated
Makefile: import-interactives