fix issue with dropping bar when switching between lifetime view and other interval views. refactor index html and css. changed label '10-year' to 'decade' on main page
changed position from relative to absolute
Merge branch 'master' of https://github.com/shidel-dev/goals-visualization-final-project into st/fix_drop_bar

Conflicts:
	app/assets/stylesheets/index.css
Merge pull request #42 from shidel-dev/st/fix_drop_bar

St/fix drop bar