Update and rename ExtJS.gitignore to ExtJS MVC.gitignore

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

-# build directory for Sencha (ExtJS) projects
-build/
-
-
-# bootstrap files are for development only,
-# and autogenerated on app build.
-# You should build your project after every
-# clone, checkout, merge, etc. To enshure using the
-# last version of the theme an to include paths to required sources
-
-bootstrap.js
-bootstrap.css
\ No newline at end of file