tweak: Exit with message instead of a panic

In case no application is found in GOPATH(s), exit with a friendly
message instead of a panic. Also removed useless else block in watch.go.

run.go

@@ -87,7 +87,7 @@ func runApp(cmd *Command, args []string) int {
 			currentGoPath = _gopath
 			appname = path.Base(currpath)
 		} else {
-			panic(fmt.Sprintf("No Beego application '%s' found in your GOPATH", args[0]))
+			exitPrint(fmt.Sprintf("No Beego application '%s' found in your GOPATH", args[0]))
 		}
 
 		ColorLog("[INFO] Using '%s' as 'appname'\n", appname)

watch.go

@@ -240,9 +240,8 @@ func shouldIgnoreFile(filename string) bool {
 		}
 		if r.MatchString(filename) {
 			return true
-		} else {
-			continue
 		}
+		continue
 	}
 	return false
 }