Merge pull request #156 from silx-kit/fix-contributing

Add "install:extension" command (again?) so that CONTRIBUTING commands go through

Author: loichuder

package.json

@@ -44,6 +44,7 @@
     "build:labextension": "jupyter labextension build .",
     "build:labextension:dev": "jupyter labextension build --development True --source-map True .",
     "build:lib": "tsc --project tsconfig.build.json",
+    "install:extension": "jlpm build",
     "clean": "jlpm run clean:lib",
     "clean:lib": "rimraf lib tsconfig.tsbuildinfo",
     "clean:labextension": "rimraf jupyterlab_h5web/labextension",