Fix parseRoles for Canvas style roles

Roles in Canvas look like this:

    LIS_V2_ROLE_MAP = {
      'user' => 'http://purl.imsglobal.org/vocab/lis/v2/system/person#User',
      'siteadmin' => 'http://purl.imsglobal.org/vocab/lis/v2/system/person#SysAdmin',

      'teacher' => 'http://purl.imsglobal.org/vocab/lis/v2/institution/person#Instructor',
      'student' => 'http://purl.imsglobal.org/vocab/lis/v2/institution/person#Student',
      'admin' => 'http://purl.imsglobal.org/vocab/lis/v2/institution/person#Administrator',
      AccountUser => 'http://purl.imsglobal.org/vocab/lis/v2/institution/person#Administrator',
      TaEnrollment => ['http://purl.imsglobal.org/vocab/lis/v2/membership/instructor#TeachingAssistant', 'http://purl.imsglobal.org/vocab/lis/v2/membership#Instructor'],
      StudentEnrollment => 'http://purl.imsglobal.org/vocab/lis/v2/membership#Learner',
      TeacherEnrollment => 'http://purl.imsglobal.org/vocab/lis/v2/membership#Instructor',
      DesignerEnrollment => 'http://purl.imsglobal.org/vocab/lis/v2/membership#ContentDeveloper',
      ObserverEnrollment => 'http://purl.imsglobal.org/vocab/lis/v2/membership#Mentor',
      StudentViewEnrollment => 'http://purl.imsglobal.org/vocab/lis/v2/membership#Learner'
    }

So if you pop out the #anchor they work with isLearner isStaff and isAdmin

Source: https://github.com/instructure/canvas-lms/blob/e5a181caa320bcec6ca8394dc2a0d35b02e207a2/lib/lti/substitutions_helper.rb#L42
- Related: https://github.com/IMSGlobal/LTI-Tool-Provider-Library-PHP/issues/23

Izumi-kun / LTI-Tool-Provider-Library-PHP

Fix parseRoles for Canvas style roles #3