* Revive fixes regarding following set of rules:
[rule.if-return]
[rule.increment-decrement]
[rule.var-declaration]
[rule.package-comments]
[rule.receiver-naming]
[rule.unexported-return]
This will basically make the root directory a place for storing the
major telegraf interfaces, which will make telegraf's godoc looks quite
a bit nicer. And make it easier for contributors to lookup the few data
types that they actually care about.
closes#564
Paweł Żak
Dennis Schön
Cameron Sparr
Jack Zampolin
Vinh