upgrade yargs 3.5.4 -> 3.10.0

we need a version with better support for 'array' params
see: https://github.com/bcoe/yargs/pull/164

npm-shrinkwrap.json

@@ -115,9 +115,9 @@
       "resolved": "https://registry.npmjs.org/wordwrap/-/wordwrap-0.0.2.tgz"
     },
     "yargs": {
-      "version": "3.5.4",
-      "from": "yargs@>=3.5.4 <3.6.0",
-      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.5.4.tgz"
+      "version": "3.10.0",
+      "from": "yargs@>=3.10.0 <3.11.0",
+      "resolved": "https://registry.npmjs.org/yargs/-/yargs-3.10.0.tgz"
     },
     "zeparser": {
       "version": "0.0.7",

package.json

@@ -32,7 +32,7 @@
     "async": "~0.2.6",
     "source-map": "~0.5.1",
     "uglify-to-browserify": "~1.0.0",
-    "yargs": "~3.5.4"
+    "yargs": "~3.10.0"
   },
   "devDependencies": {
     "acorn": "~0.6.0",