Remove files and directories starting with a dot

[adamziel]

Removes files and directories starting with a dot (.) from the components directory.

As @marcusconnor noted in #193, some spam/malware scanners are alerted by files and directories starting with a dot, e.g. .github, .gitattributes, etc. While there's nothing inherently wrong with those files, we also don't need them in the repository – they're a part of inlined vendor dependencies.

Fixes #193