Yi v0.9.1

Lua framwork Yi v0.9.1
Stable Interfaces and more limits to avoid making mistakes.

• actor: added model(), service() and view()
• cell: new Class for layer view, model, serivce and handler, extend from Cell and get powerfull interfaces
• Removed outdated interfaces and publice objects, like Yi.load(), magic() etc.
• Keep only a few global objects.

v0.8.0 a new version

按照常规发布 release