Initial commit
Add composer.json.
Add key value form type.
Initial tests.
Add 'src/Silvestra/Component/Form/' from commit '562b0fda1b52b287dc89b7dc2340837fb93c3245'

git-subtree-dir: src/Silvestra/Component/Form
git-subtree-mainline: 3792082b67ccb6c82dffd9db8b026a5819f5a1bd
git-subtree-split: 562b0fda1b52b287dc89b7dc2340837fb93c3245