Make leaflet controls more consistent

fixes #155 (closed)

All controls should have same:

• color: rgb(51, 51, 51);
• font-size: 12px;
• font-family: "Roboto", "Helvetica Neue", Helvetica, Arial, sans-serif;
• padding: 5px 10px;

Then clickable controls should have more "button" like styles,

• font-weight: 700;
• text-transform: uppercase;