New Updated Studio Documentation

New documentation from rewrite, audit, and integration of some
documentation from edx101.  Intent to release by training on 12/5.
Editorial updates

update to checking student progress, create new course, index, open
response assessment
adding images for ORA
Continued Editorial work

Continued Editorial work
Continued edits

Worked through Andy's list
Merge pull request #1835 from edx/documentation/new_studio_doc/12-04-13

Documentation/new studio doc/12 04 13