Merge pull request #1197 from TonyArra/extjs

Add gitignore for Sencha/Extjs

ExtJS-MVC.gitignore

-# build directory for Sencha (ExtJS) projects
-build/
-
-# bootstrap files are regenerated by Sencha CMD on every build or refresh
-bootstrap.js
-bootstrap.css

ExtJs.gitignore

+.architect
+boostrap.json
+build/
+ext/