reworked menu to be more obvious

Issue #63
Merge pull request #66 from icrni/menu_rework

reworked menu to be more obvious
reworked map markers behavior
Merge pull request #67 from icrni/map_markers

reworked map markers behavior
Bing tile age overlay

Issue #59
Merge pull request #68 from icrni/map_markers

Bing tile age overlay
map height adjust to screen size

Issue #65
Merge pull request #69 from icrni/map_markers

map height adjust to screen size
small fix for map div
Merge pull request #70 from icrni/map_markers

small fix for map div
polygon color status fix
Merge pull request #71 from icrni/map_markers

polygon color status fix
fix editing of existing polygons

Issue #50
Merge pull request #72 from icrni/map_markers

fix editing of existing polygons
small fix for creating new polygon
Merge pull request #73 from icrni/map_markers

small fix for creating new polygon
Add simple "About" page and GH Fork link
Merge pull request #76 from dodobas/about_page

Add simple "About" page and GH Fork link