Add Email Address and Name field to Help form

 * Add name and email fields to help_request via migration
 * Hide detail fields that user cannot change on form
 * Add name and email fields, and ensure that they are required with
   validates_presence.

Adjust loading bar in bootstrap modal to disappear when modal loaded

 * Added $('body').modalmanager('loading'); - which toggles the loading
   bar off when called after the modal window has loaded

This is a one-liner, so adding onto dltp-225 commit which also deals
with the modal window.

dltp-225#
dltp-233#
Adding factory attributes for help request

With updates to the HelpRequest model, the specs were failing. The
changes to the factory should account for the new attributes that are
required.
Adding catch for invalid exception
Merge pull request #46 from ndlib/dltp-225

Add Email Address and Name field to Help form