Add Collapsing, Expanding and Removing Events

* build(composer): add archive

* chore(gitattributes): add .gitattributes

* issue1976

* issue1976_grunt_js

* fixed content-wrapper height

* updated content wrapper height

https://github.com/almasaeed2010/AdminLTE/issues/1925

- without them the npm package is crippled

- it's hard to import admin-lte less files since many of them reference missing bower_components

With the new one, the widget is not hidden in scrolling container

fix checkboxes for Issue type

This PR will fix missing Chart.js on Index2.html. This missing file causes by typo which is written Chart.js where it should be chart.js

Add issue template to make dealing with issues easier by having users supply relevant information upfront.