* removed vendor from .gitignore
* updated and added dependencies in vendor folder

- Reflected MobileESP's move to GitHub
- Pinned versions for greater consistency

This reverts commit 4d140b80.

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And do not ignore /vendor any more.

List all files, that are ignored, yet tracked and remove
them from the repository without deleting them on disk:

    $ git ls-files -ci --exclude-standard -z | xargs -0 git rm --cached