fix parallel_tests (close #3162)
`parallel_test` need to use in dev and test, to generate rails test app
add Documentation section to the readme

This should help to make clear that the http://activeadmin.info docu is out of date for 1.0
Add persian locale
Merge pull request #3167 from AmirKarimi/master

Add Persian locale
Merge pull request #3166 from timoschilling/patch-1

add Documentation section to the readme
Merge pull request #3165 from timoschilling/fix_parallel_tests

fix parallel_tests (close #3162)
Gemfile shuffle