Fixes spelling issues and import alphabetical issues

Using goreportcard.com I noticed a few spelling errors. I really love codegangsta/cli
and wanted to help improve it.

app.go

@@ -9,7 +9,7 @@ import (
 	"time"
 )
 
-// App is the main structure of a cli application. It is recomended that
+// App is the main structure of a cli application. It is recommended that
 // an app be created with the cli.NewApp() function
 type App struct {
 	// The name of the program. Defaults to path.Base(os.Args[0])

app_test.go

@@ -2,6 +2,7 @@ package cli
 
 import (
 	"bytes"
+	"errors"
 	"flag"
 	"fmt"
 	"io"
@@ -9,7 +10,6 @@ import (
 	"os"
 	"strings"
 	"testing"
-"errors"
 )
 
 func ExampleApp_Run() {
@@ -947,7 +947,7 @@ func TestApp_Run_DoesNotOverwriteErrorFromBefore(t *testing.T) {
 
 	err := app.Run([]string{"foo"})
 	if err == nil {
-		t.Fatalf("expected to recieve error from Run, got none")
+		t.Fatalf("expected to receive error from Run, got none")
 	}
 
 	if !strings.Contains(err.Error(), "before error") {
@@ -975,7 +975,7 @@ func TestApp_Run_SubcommandDoesNotOverwriteErrorFromBefore(t *testing.T) {
 
 	err := app.Run([]string{"foo", "bar"})
 	if err == nil {
-		t.Fatalf("expected to recieve error from Run, got none")
+		t.Fatalf("expected to receive error from Run, got none")
 	}
 
 	if !strings.Contains(err.Error(), "before error") {

flag.go

@@ -4,10 +4,10 @@ import (
 	"flag"
 	"fmt"
 	"os"
+	"runtime"
 	"strconv"
 	"strings"
 	"time"
-	"runtime"
 )
 
 // This flag enables bash-completion for all commands and subcommands
@@ -30,7 +30,7 @@ var HelpFlag = BoolFlag{
 }
 
 // Flag is a common interface related to parsing flags in cli.
-// For more advanced flag parsing techniques, it is recomended that
+// For more advanced flag parsing techniques, it is recommended that
 // this interface be implemented.
 type Flag interface {
 	fmt.Stringer