disable background toggle background in cemetery

closes #71
disable add person in cemetery

closes #75
disable terminate and silence all in cemetery

we still had the terminate and silence all functions available in the
cemetery if there were people still in biosphere.
animation of apocolypse button

commented out effect for just persons not entire biosphere for a choice
once discussed with everyone.
Removed erroneous comments
hide population header in cemetery view

close #72
Hide elements based on class instead of javascript
Cleanup CSS
Cleanup javascript and fix bug

- Need variables for jQuery selectors
- Fix bug when switching from cemetery where buttons would be re-enabled
Add rotate animation when entering the cemetery

This uses the CSS3 transition and transform properties instead of using
jQuery animate
Fix animation for apocolypse

Closes #35
Fix icon swap for silence all button
Fix minor bugs and add comments
add silence-text class
Merge branch 'master' of https://github.com/ejwaibel/GWDA243_Spring2014

Conflicts:
	js/main.js
fix silence text
Remove unnecessary style
Cleanup code and move timer functions to named functions
Merge branch 'master' into gh-pages

Conflicts:
	js/main.js