general code cleanup
Merge pull request #24 from Hendrixer/code-cleanup

general code cleanup
feat: show and hide sign in and sign out based on auth status
feat: button to retieve and display fitbit data async on dash
Merge branch 'feat' of https://github.com/Hendrixer/Fittr into feat

Conflicts:
	public/js/app.js
	public/js/services.js