New state tests (#5418)

* General state tests

* Allow dir name for a test

ethcore/src/json_tests/mod.rs

@@ -21,8 +21,5 @@ mod transaction;
 mod executive;
 mod state;
 mod chain;
-mod homestead_state;
 mod homestead_chain;
-mod eip150_state;
-mod eip161_state;
 mod trie;