Provide experiment creator an escape from validation

[priyald17]

Add "verify" vs. "submit" options, or perhaps verify each panel as it is passed through in the flow.
Allow user to continue anyway even if there are errors.

Difficulty: some of the dynamic validation of fields will now need to be done at the beginning, as the user may re-enter the experiment creation view with invalid fields.

Master issue: #63

EDIT: This feature is two-pronged:

1. Verify button -- indicate error to users.
2. Save button -- if errors, alert user. However, allow them to continue if they would like.