return versions in get_uik
Show versions of UIK in Editor panel
Added walk through extent history using Prev/Next shortcuts
Merge branch 'master' of https://github.com/nextgis/uik_geo
commit of static/build/ files related to extent history #3
#4: basic view of versioning
Merge with branch versions
Merge pull request #3 from vpavlenko/master

Added walk through extent history using Prev/Next shortcuts