Sprint 34 Hotfix

Contains fixes from:

* https://github.com/adobe/brackets/pull/6058 Monkeypatch: in CodeMirror, revert less.js to a working version
* https://github.com/adobe/brackets/pull/6068 Filter out dotfiles in code hints

Also, update version strings to 0.34.1.

Please note that this pull request is merging to a new `sprint-34-hotfix` branch and not `master`.