Resolve "Verify TLS certificate of Plugin Server"

Closes #78 

Please note that this adds basic TLS verification (a big improvement over the current status!) but there is still room for enhancement: certificate pinning or CA pining, disabling TLS1.0, and probably some more. I'm leaving those for a separate MR (and probably further discussion)

See merge request !6

this also has improvements about cert verification: urllib2 supports
subjectAltNames, which ssl+ftplib does not.

Added plugin for syntax highlighting.

Added plugin for syntax highlighting.

See merge request !5

[anti_spam] 0.4.3 more in CHANGELOG

See merge request !2

Anti spam functionality



See merge request !1

And Clean up some files from Github migration