usql update

usql is still very primitive..it just barely works

usql/lexer.h

@@ -20,12 +20,14 @@ namespace usql {
 	greater_equal,
 	lesser,
 	lesser_equal,
+	keyword_as,
 	keyword_create,
 	keyword_table,
 	keyword_where,
 	keyword_delete,
 	keyword_update,
 	keyword_load,
+	keyword_save,
 	keyword_from,
 	keyword_insert,
 	keyword_into,
@@ -35,7 +37,7 @@ namespace usql {
 	keyword_copy,
 	keyword_not,
 	keyword_null,
-	keyword_int,
+	keyword_integer,
 	keyword_float,
 	keyword_varchar,
 	int_number,