Full extension view according to @noname as implemented by @coolbung and a few more improvements in response to feedback received
Merge pull request #224 from emavro/feature-appstore-server

Full extension view according to @nonumber as implemented by @coolbung and @emavro : Thanks to both!
Image folder and half of JS code cleaned up
Merge pull request #225 from emavro/feature-appstore-server

Image folder and half of JS code cleaned up
Merged full view and other changes from @emavro
More conditions for buttons added
Merge pull request #226 from emavro/feature-appstore-server

More conditions for buttons added
Merge branch 'feature-appstore-server' of github.com:joomla-projects/joomla-cms into feature-appstore-server
Fixed sidebar active state indication for all sub-levels
Merge pull request #227 from beat/feature-appstore-server

Feature appstore server
Added language strings for Register & Download and for Purchase & Download for not-updated JED entries, and used them including tests
Merge pull request #229 from beat/feature-appstore-server

Added precise buttons Register & Download and Purchase & Download for not-updated JED entries
Merge branch 'feature-appstore-server' of github.com:joomla-projects/joomla-cms into feature-appstore-server
Mime-type fixed
Merge branch 'feature-appstore-server' of https://github.com/joomla-projects/joomla-cms into feature-appstore-server
Better mime-type implementation
Merge pull request #230 from emavro/feature-appstore-server

Mime-type fixed
Buttons to external links changed to <a> tags
target="_blank" added
Missing space fixed