display toggle elements added to minimap
toggle button styled and toggle function built.  Need background images
toggle button styling
modified css for consistent spacing
added example and image files
Merge branch 'master' of https://github.com/ktraff/Leaflet-MiniMap
Merge pull request #8 from ktraff/master

New Option to Minimize/Maximize Mini-Map - Good idea, looks nicely implemented. Thanks!