Remove internal/cmd/gen, it has no use for the end-developer.

Former-commit-id: 12bead9d379c6644e391c482fe71b2e88263376c

core/logger/dev.go

@@ -12,6 +12,9 @@ import (
 	"time"
 )
 
+// NewDevLogger returns a new logger of io.Writer which
+// formats its log message input and writes it
+// to the os.Stdout.
 func NewDevLogger(omitTimeFor ...string) io.Writer {
 	mu := &sync.Mutex{} // for now and last log
 	lastLog := time.Now()

core/logger/logger.go

@@ -26,7 +26,7 @@ type stringWriter interface {
 	WriteString(string) (int, error)
 }
 
-// Log sends a message to the defined io.Writer logger, it's
+// Log sends a message to the defined logger of io.Writer logger, it's
 // just a help function for internal use but it can be used to a cusotom middleware too.
 //
 // See AttachLogger too.

core/logger/noop.go

@@ -4,4 +4,6 @@
 
 package logger
 
+// NoOpLogger returns a new, non-operational logger of io.Writer,
+// it does nothing any form of input.
 var NoOpLogger = writerFunc(func([]byte) (int, error) { return -1, nil })