* Run gofmt -s and golint on the codebase

Run golint and fix everythign it flagged (except the context arg
ordering), mostly edits in the rewrite plugin.
Signed-off-by: Miek Gieben <miek@miek.nl>

* ... and ofcourse the test as well
Signed-off-by: Miek Gieben <miek@miek.nl>