Merge pull request #2 from rvadym/master

menu
sym links
Merge branch 'master' of https://github.com/atk4/atk4-codepad
cleen
added updater
fixes
integrate composer
adds tructure!
remove ds addons
fiew more sylinks
fixes
button with menu dropup
use new agiletoolkit button class
fix
elements page
Merge pull request #3 from alexeyostapets/master

elements page
changes for elements
content to md files
menu (top part is new)
mp templates