Repo: Set --quiet flag (aka --loglevel warn) for npm-install

Gets rid of the unnecessary http log, while still outputting a useful
summary and any warnings or errors.

Fixes gh-44

Author: jzaefferer

lib/repo.js

@@ -18,15 +18,15 @@ Release.define({
 		console.log();
 
 		console.log( "Installing dependencies..." );
-		Release.exec( "npm install", "Error installing dependencies." );
+		Release.exec( "npm install -q", "Error installing dependencies." );
 		console.log();
 
 		projectRelease = require( Release.dir.repo + "/build/release" );
 
 		if ( projectRelease.dependencies ) {
 			console.log( "Installing release dependencies..." );
 			releaseDependencies = projectRelease.dependencies.join( " " );
-			Release.exec( "npm install " + releaseDependencies,
+			Release.exec( "npm install -q " + releaseDependencies,
 				"Error installing release dependencies." );
 			console.log();
 		}