add italic font
Merge pull request #522 from optimizely/dfoxpowell/sentinel-italic

add italic font
re add sentinel
Merge pull request #523 from optimizely/dfoxpowell/sentinel-italic

re add sentinel
add screensmart italic
Merge pull request #524 from optimizely/dfoxpowell/sentinel-italic

add screensmart italic
Merge branch 'master' of github.com:optimizely/marketing-website into dfoxpowell/optimizely-org-page
add new sentinel italic font