Several NAR UI changes

Navigation Menu
1. Changed "Data and Findings" to "Data"
2. Changed "Contacts & Citations" to "Contacts and Citation"
3. Rewired Nav to wiki pages (NAWQAAN-382)
Home page
1. Wrote out "Unites States" for site report button
2. In description "Nations" is now "Nation's"
Sites map
1. Added title bar similar to that on the Coastal and MRB reports. Title bar says: "Streams and Rivers Across the Unites States"
2. Added hovers to the buttons
3. Made filter by stand fit in with the filters more.
MRB 
1. Changed order of -Select Nutrient Type- menu. Order should be Total Nitrogen, Nitrate, Total Phosphorus
Download page
1. Changed "Clear Filters" to "Change Selection Criteria"