Switch to new package format

info.yml

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+name: npm
+description: Package Manager for JavaScript
+version: 12.0.0-pre.0.0
+revision: 2
+url: https://www.npmjs.com/
+license: Artistic-2.0
+maintainers:
+  - [email protected]
+architecture: any
+output_architecture: any
+type: source
+depends:
+  - node-gyp
+  - nodejs
+  - nodejs-nopt
+optional_depends:
+  - git
+make_depends:
+  - git
+downloads:
+  - url: https://github.com/npm/cli.git
+    type: git
+    clone_to: ${BPM_SOURCE}
+    git_branch: v${BPM_PKG_VERSION}
+    checksum: 4296f64beaa514581952a17ab82b6f1bcc0761e1