Added add method to LocalStorage

Removed .scrutinizer.yml

Delete tests/fixtures directory

Merge pull request #10 from quillstack/update/unit-tests-0.x-dev

Fixed unit tests

Updated versions in composer

Merge pull request #8 from quillstack/update/branch-alias

Added branch alias

Merge pull request #3 from quillstack/hotfix/exception-names

Changed exceptions names