update README to install azk from de source
Adding persistent_folders in bin/azk#make_data_folders.
added instructions for `Contributions and testing` in `REAMDE`
Merge pull request #127 from gullitmiranda/master

added instructions for `Contributions and testing` in `REAMDE`
Merge branch 'master' azukiapp/azk into readme
Changing repository packages url on README