[ALOY-1039] Alloy version built from 1_4_X branch is "1.4.0-alpha4"

Problem description

Alloy version installed from the 'Appcelerator/Alloy' repository is "1.4.0-alpha4". Current latest npm-packaged Alloy version is 1.4.0-beta

Steps to reproduce

1. Install Alloy from https://github.com/appcelerator/alloy/tree/1_4_X , for example typing

sudo npm install -g git://github.com/appcelerator/alloy.git#1_4_X

or cloning the repo locally, switching to 1_4_X branch and typing:

sudo npm install -g .

2. Check the Alloy version typing:

alloy -v

Result: Alloy version reported is 1.4.0-alpha4. Expected result: latest packaged version available through npm is 1.4.0-beta