Merge pull request #32 from segmentio/dont-set-profile

setting AWS_PROFILE as part of exec leads to errors in some apps:

Author: dfuentes

cmd/exec.go

@@ -145,7 +145,6 @@ func execRun(cmd *cobra.Command, args []string) error {
 
 	env.Set("AWS_ACCESS_KEY_ID", creds.AccessKeyID)
 	env.Set("AWS_SECRET_ACCESS_KEY", creds.SecretAccessKey)
-	env.Set("AWS_PROFILE", profile)
 
 	if creds.SessionToken != "" {
 		env.Set("AWS_SESSION_TOKEN", creds.SessionToken)