Adding functionlity to upload/remove profile image.

lms/djangoapps/student_profile/views.py

lms/static/js/spec/student_account/helpers.js

...atic/js/spec/student_profile/learner_profile_view_spec.js

lms/static/js/student_account/models/user_account_model.js

...tatic/js/student_profile/views/learner_profile_factory.js

...static/js/student_profile/views/learner_profile_fields.js

lms/static/js/student_profile/views/learner_profile_view.js

lms/static/js/views/fields.js

lms/static/js/views/message_banner.js

lms/static/sass/views/_learner-profile.scss

lms/templates/fields/field_image.underscore

lms/templates/message_banner.underscore

lms/templates/student_profile/learner_profile.html

lms/templates/student_profile/learner_profile.underscore