added new icons and updated header to use them
added right arrow to settings
Merge pull request #145 from tidepool-org/ianjorgensen/icons

added new icons and updated header to use them
remove unused icons
fix header interactions for active/inactive buttons
Merge pull request #148 from tidepool-org/jebeck/fix-example-interactions

fix example interactions
Merge branch 'master' into jebeck/message-cursors