Merge pull request #9 from numenta/master

Merge numenta:master@HEAD
Update numenta logo
Remove custom stylesheet, fall back to default because qmi isn't compatible with Doxygen 1.8.7
Merge pull request #953 from utensil/952-doxygen-style-fix

Remove custom stylesheet, fall back to default because qmi isn't compatible with Doxygen 1.8.7