Add /usermaterials/ endpoint

[jrjohnson]

This will return all of the learning materials for a user as simple objects

{
  titie: '',
  type: '',
  description: '',
  authorName: '',
  sessionTitle: '',
  courseTitle: '',
  assignmentDate: ''
  absoluteUri: '',
  learningMaterialId: '',
  courseId: '',
  sessionId: '',
  isRequired: '',
  mimeType: '',
  filename: '',
  citation: '',
  weblink: '',
  publicNotes: ''
}