HR should be able to assign employees to training programs

[AdamSheaffer]

Acceptance Criteria

Given user is viewing the details of an employee
When user clicks on the Assign to Training Program link
Then a form should be presented in which all eligible* training programs are in a multi-select dropdown with any training programs that are currently assigned to the student already selected
And a button labeled Assign

Given user is viewing the training program assignment form
And the user has chosen training programs from the dropdown
When user clicks on the Assign button
Then the relationships should be created in the database
And the user should be redirected back to the employee detail view