build: fix conflict w/ gulp version built-in param

Author: damyanpetev

README.md

@@ -12,7 +12,7 @@
 
 
     ```
-    npm run build -- --version 17.1 --ignite-ui http://localhost/ig_ui17.1
+    npm run build -- --ignite-version 17.1 --ignite-ui http://localhost/ig_ui17.1
     ```
 
 3. The built samples will be located under the ./dist folder.

gulpfile.js

@@ -4,7 +4,7 @@ var gulp = require("gulp"),
 	createFiddleFiles = require("./build/createFiddleFiles.js");
 
 var argv = require('minimist')(process.argv.slice(2));
-var version = argv.version; //should be passed as --version ${TRAVIS_BRANCH}
+var version = argv["ignite-version"]; //should be passed as --ignite-version ${BRANCH}
 
 var dist = "./dist",
 	copySrc = [