added responsive js

in responsive.js break points for map elements will be called and set.
Attribution is now responsive.

Attribution div now flips to be opposite of toolbar.  Zoom buttons were
removed for the time being.
ZoomControl False
Splash Page Framework Added

A div for the splash page has been added to index.html.  The code to
show and hide divs is in the responsive.js.
Navbar work

Added drop down for locations with place holder icons.  Commented out
splash page div for now, easier to work with while we develop.
Image slideshow with slider
adding Julia's initial icon designs
Added tile toggle button

Allows user to add and then remove the historic basemap (1945 Zoning)
points of interest geoJSON and a test photo
Uncomment Splash Page

Splash page code now loads prior to map
caroline updates
Updated icon images
updated file name of icon image
updating gh-pages with new css
updating gh-pages