+ redis magic flag for redis value.
- remove unecessary func rvalue2str
* [bug] get key.value can not work.
* update README for key's attributes support
*[bug] dbOverwrite should not assert fail for no such key in dict(it should be in db)
Merge branch 'feature/iDB' into develop
*[bug] subkeys command: server crash if pattern parameter is nil
+ unit test for subkeys command
+ [test] idb to test_helper.tcl
* [bug] minor attribute get/set fixed.
+ escape the '.' char in key name simply.
* * [bug] subkeys pattern parameter null make server crash
* update README
Merge branch 'feature/iDB' into develop

Conflicts:
	src/idb_redis.c
*[test] more test on subkeys
* exists func move idb to idb_redis
+ aset/aget/aexists/adel commands