Allow to use 'in' statement with 'order by'

When we used query like
`select * from commits where 'cloudson' in hash order by date asc`
gitql has failed.
This closes #20 .

runtime/commits.go

@@ -55,10 +55,8 @@ func walkCommits(n *parser.NodeProgram, visitor *RuntimeVisitor) (*TableData, er
 	if err != nil {
 		return nil, err
 	}
-	if usingOrder {
-		if counter > s.Limit {
-			counter = s.Limit
-		}
+	if usingOrder && counter > s.Limit {
+		counter = s.Limit
 		rowsSliced = rowsSliced[0:counter]
 	}
 	tableData := new(TableData)

runtime/reference.go

@@ -52,10 +52,8 @@ func walkReferences(n *parser.NodeProgram, visitor *RuntimeVisitor) (*TableData,
 	if err != nil {
 		return nil, err
 	}
-	if usingOrder {
-		if counter > s.Limit {
-			counter = s.Limit
-		}
+	if usingOrder && counter > s.Limit {
+		counter = s.Limit
 		rowsSliced = rowsSliced[0:counter]
 	}
 	tableData := new(TableData)

runtime/remotes.go

@@ -54,10 +54,8 @@ func walkRemotes(n *parser.NodeProgram, visitor *RuntimeVisitor) (*TableData, er
 	if err != nil {
 		return nil, err
 	}
-	if usingOrder {
-		if counter > s.Limit {
-			counter = s.Limit
-		}
+	if usingOrder && counter > s.Limit {
+		counter = s.Limit
 		rowsSliced = rowsSliced[0:counter]
 	}
 	tableData := new(TableData)

runtime/runtime_test.go

@@ -104,3 +104,29 @@ func TestCanConvertToTypeFormats(t *testing.T) {
 	typeFormat := "json"
 	Run(ast, &typeFormat)
 }
+
+func TestNotFoundCommitWithInStatementAndSorting(t *testing.T) {
+	folder, errFile := filepath.Abs("../")
+
+	if errFile != nil {
+		t.Errorf(errFile.Error())
+	}
+
+	query := "select author from commits where 'thisisnotfound' in hash order by date desc"
+
+	parser.New(query)
+	ast, errGit := parser.AST()
+	if errGit != nil {
+		t.Errorf(errGit.Error())
+	}
+	ast.Path = &folder
+	errGit = semantical.Analysis(ast)
+	if errGit != nil {
+		t.Errorf(errGit.Error())
+	}
+
+	typeFormat := "table"
+	if errGit = Run(ast, &typeFormat); errGit != nil {
+		t.Errorf(errGit.Error())
+	}
+}