UI changes

1. Contacts and Citations = Contacts and Citation (in both nav and on the page)

2. Clear selection criteria and download button on the download data color switch

3. Moved the 'Data' menu option over to the right just a little so that there is equal spacing between all three - 'Data' / 'Network Information' / 'About'

4. Switched the order of the Nitrate in Coastal River button and the Mississippi River button (and how they are ordered in the menu drop down).