Refactored main.go

The main function - whuch runs aptly commands - has been taken out from
main.go and included to the cmd package. This is useful for the aptly
script run command, which should use that behaviour.

main.go

@@ -1,38 +1,10 @@
 package main
 
 import (
-	"fmt"
 	"github.com/smira/aptly/cmd"
 	"os"
 )
 
 func main() {
-	defer func() {
-		if r := recover(); r != nil {
-			fatal, ok := r.(*cmd.FatalError)
-			if !ok {
-				panic(r)
-			}
-			fmt.Println("ERROR:", fatal.Message)
-			os.Exit(fatal.ReturnCode)
-		}
-	}()
-
-	command := cmd.RootCommand()
-
-	flags, args, err := command.ParseFlags(os.Args[1:])
-	if err != nil {
-		cmd.Fatal(err)
-	}
-
-	err = cmd.InitContext(flags)
-	if err != nil {
-		cmd.Fatal(err)
-	}
-	defer cmd.ShutdownContext()
-
-	err = command.Dispatch(args)
-	if err != nil {
-		cmd.Fatal(err)
-	}
+	cmd.Run(os.Args[1:], true)
 }