Update discussion.md

- fixed typo
- roles 'moderator' and 'administrator' are explained as bullet points.
Add logging to save item
Clean up text of Order Confirmation E-mail.
Merge pull request #894 from edx/diana/confirmation-email

Clean up text of Order Confirmation E-mail.
Add Learning Tools Interoperability (LTI) blade.

LTI blade allows to include LTI components to courses.
Python integration, Jasmine and acceptance tests are included.
Merge pull request #910 from edx/alex/add_lti_to_rc

Alex/add lti to rc
cleanup copy on reqs, photo, and choose pages
Update `requests` library to 1.2.3
Use oauthlib directly for LTI module
modal functionality for edit name on vcerts
Verification: revising textarea reset formatting and increasing close modal control size
Prevent being able to click on disabled button in IE.
Enable display of course org, num in receipt page.
Merge pull request #913 from edx/ormsbee/certs_small_ux

Small UI fixes
Fix element name conflict
Merge pull request #915 from edx/jkarni/fix/textbook-upload

Jkarni/fix/textbook upload
Require that permission be given for Flash camera before we process snapshots.
Improve accessibility of forums navigation elements

The home icon and discussion topic drop-down icon now have text that is
visible only to screen readers. The visual change between the icon and the
topic name with down-arrow is now achieved with the CSS visible property
instead of the opacity property, so only one at a time will be visible to
screen readers as well as visually.
Pass hostname to LTI XModule

Necessary for RFC compliance with oauthlib
Merge pull request #917 from edx/ormsbee/check_flash_video_permissions

Check flash video permissions before enabling next step
If user has previously selected a price, show it on the choose page