Fix invalid runner-cli bin files, Closes #122

This was because of our fix for installation during the monorepo.
This is an open problem of Lerna:
* lerna/lerna#385
* lerna/lerna#1444

package.json

@@ -90,6 +90,7 @@
     "lint": "tslint packages/*/lib/**/*.ts packages/*/test/**/*.ts --exclude '**/*.d.ts'",
     "build": "tsc",
     "doc": "typedoc --name Comunica --exclude \"**/+(node_modules|test|mocks)/**\" --disableOutputCheck --mode modules --out documentation $(find packages ! -name 'packager' -type d -mindepth 1 -maxdepth 1)",
+    "preinstall": "node -e \"if (!fs.existsSync('packages/runner-cli/bin/run.js')) { var os = fs.createWriteStream('packages/runner-cli/bin/run.js'); os.write('#!/usr/bin/env node\\nconsole.error(\\'Temporary runner script during lerna installation. If you see this, please run yarn install again.\\');\\nprocess.exit(1);'); os.end(); }\"",
     "postinstall": "lerna bootstrap && tsc"
   }
 }

packages/runner-cli/package.json

@@ -39,7 +39,6 @@
   "scripts": {
     "lint": "node \"../../node_modules/tslint/bin/tslint\" lib/**/*.ts test/**/*.ts --exclude '**/*.d.ts'",
     "build": "node \"../../node_modules/typescript/bin/tsc\"",
-    "validate": "npm ls",
-    "preinstall": "node -e \"fs.openSync('bin/run.js', 'w')\""
+    "validate": "npm ls"
   }
 }