Add .sh extension to missing scripts (#339)

Author: jshcrowthe

package.json

@@ -18,9 +18,9 @@
     "dev": "lerna run --parallel --scope @firebase/* --scope firebase dev",
     "prepare": "lerna run --scope @firebase/* --scope firebase prepare",
     "prepush": "node tools/gitHooks/prepush.js",
-    "stage:packages": "./scripts/prepublish",
-    "prepublish:packages": "./scripts/prepublish --prod",
-    "publish:packages": "./scripts/publish",
+    "stage:packages": "./scripts/prepublish.sh",
+    "prepublish:packages": "./scripts/prepublish.sh --prod",
+    "publish:packages": "./scripts/publish.sh",
     "repl": "node tools/repl.js",
     "pretest": "node tools/pretest.js",
     "test": "lerna run --parallel test",

scripts/publish.sh

@@ -9,4 +9,4 @@ DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
 export PATH="$(npm bin):$PATH";
 
 # Run the publish script in each directory
-lerna exec --scope @firebase/* --scope firebase -- $DIR/try-publish
+lerna exec --scope @firebase/* --scope firebase -- $DIR/try-publish.sh