Edit now works

  * Users may edit any detail by doubleclick
  * can edit the information
  * then info is saved to firebase when focus lost
    or enter pressed
Don't let anything be empty

  * add a check to see if the value is empty on blur
  * if so, replace text with the current saved value
  * otherwise update as usual
Merge pull request #9 from mknudsen01/edit-details

Edit details