Finalize home page styles

A few things

1. Changed placement of the burger and the USGS logo on mobile, so the burger is on the left side of the phone.  Also made the dropdown buttons for the burger bigger and easier to click and see. 

2. On mobile the new pubs does not disappear, but plops on top of the twitter box.

3. Tested on the three major browsers(Chrome, Safari, and Firefox) and the homepage interacted exactly the same as I expected besides a Firefox search box size issue I remedied.

4. Created an IE 8 shiv and ie8.css for IE 8 users.  It uses mostly the mobile from main.css which works perfectly in my eyes as it will adjust to any screen size perfectly besides mobile phones.  All that really needed to be adjusted in the ie8.css was the header and nav, also the contact page as the html 5 was not recognized by IE 8. Gotta love it.