removed kludgy display-fix for mismatched MS office file/mime-types.
fixed minor typo
initial check-in of extended upload class. refs #3218
added mimetype correction to upload process. refs #3218
added doc block.
added CSS selectors for styling the various added MS Office type learning materials. refs #3218
fixed typos and grammatical errors in code comments.
Merge pull request #81 from ucsflibtopfstedt/bug3218

supplies mime-type correction for learning material upload