Merge pull request #6 from mplaza/paulbranch

Paulbranch
Merge pull request #7 from mplaza/paulbranch

added comments to map.js and cleaned up indentations
Merge pull request #8 from mplaza/paulbranch

successful loading of dataset from dropdown list, fixed zooming
Merge pull request #9 from mplaza/paulbranch

default map is now white, dropdown menu starts without a map loaded
changed nodata background fill
slider endpoints show correct start and end years for corresponding dataset