add - baum nested package

https://github.com/etrepat/baum
update and replace - migration files
add - category models based on baum nested
add - displaying the categories from the db

no other CRUD functionality yet.
add - PHP-Vars-To-Js-Transformer package

https://github.com/laracasts/PHP-Vars-To-Js-Transformer
add - missing config for PHP-Vars-To-Js-Transformer
in progress - categories CRUD, frontend is ready
Merge pull request #1 from JarJarMP/baum-nested

Merge branch to master