Merge pull request #484 from gmoreira/v2.2.x

Removed wayward 'X' from code that was showing 'X is not defined' error
Update BootstrapSymlinkLessCommand.php

Bootstrap has moved to @twbs/bootstrap. This is already in the master branch, but we would need it in the v2.2.x branch aswell.
Update ScriptHandler.php

same here
Update composer.json

Bootstrap has moved to @twbs/bootstrap
Merge pull request #496 from Primajin/patch-2

Update ScriptHandler.php
Merge pull request #497 from Primajin/patch-4

Update composer.json
Update BootstrapSymlinkLessCommand.php

Bootstrap has moved to @twbs/bootstrap
Update composer.json

Bootstrap has moved to @twbs/bootstrap
Merge pull request #495 from Primajin/patch-1

Update BootstrapSymlinkLessCommand.php
Update mopabootstrapbundle.less related to the ScriptHandler.php update

- @import replace "bootstrap" by "twbs"
Update base.html.twig

Bootstrap has moved to @twbs/bootstrap
Update base_initializr.html.twig

Bootstrap has moved to @twbs/bootstrap
Update 2-base-templates.md

Bootstrap has moved to @twbs/bootstrap
Update css-vs-less.md

Bootstrap has moved to @twbs/bootstrap
Update mopabootstrapbundle.less
Update mopabootstrapbundle-fa.less
Update mopabootstrapbundle.css
Merge pull request #502 from 0s1r1s/patch-1

Update mopabootstrapbundle.less related to the ScriptHandler.php update
Merge pull request #503 from Primajin/v2.2.x

bootstrap to twbs in v2.2.x