remove some functions, more foucs on easy to use
update setup.py, use variable from thing.py
add transparent cache and some bugfixes
remove sharding strategy, update README
update version
update readme
Merge branch 'master' of https://github.com/lzyy/thing

Conflicts:
	README.md
	thing/thing.py
lzzy更新了新特性于是我也接着更新:P
Merge branch 'master' of https://github.com/fuxinlei/Mthing

Conflicts:
	README.md