expanded whitelist and mime-type mapping to allow uploading of all MS Office file-types in this universe and the next. refs #3166
added mimetype mapping for .docm and .dotm file extensions. refs #3166
added a bolshoi number of alternative mime-types to match the nonsense that mime-"magic" is detecting.
kludged icon display for learning materials with incorrectly detected mime-types. refs #3164
Merge pull request #53 from ucsflibtopfstedt/feat3166

expanded filetype whitelist for learning materials uploads