added license
added url to the homepage
updated README
Merge branch 'improve-docs'
fixed typos in README
added with and without attribute scopes
updated README
Merge branch 'with-and-without-scopes'
added "with" and "without" scopes
fixed README formating
Merge pull request #2 from av-ast/master

Need to update `with` and `without` scopes
update gem author
remove deprecated scopes generation
bump up version
update Readme