disable settings and two-week view if no settings data or no smbg data, respectively (disables the nav links)
Merge branch 'master' into jebeck/disable-links-when-missing-data
rev tideline version
Merge pull request #59 from tidepool-org/jebeck/disable-links-when-missing-data

disable settings and two-week view if no settings data or no smbg data