mongoose 4.4.8 发布了。此版本修复Bug和新增加的特性有：
Before starting to write code, look for existing issues. That way you avoid working on something that might not be of interest or that has been addressed already in a different branch. You can create a new issue here.
The source of this project is written in javascript, not coffeescript, therefore your bug reports should be written in javascript.
Fork the repo or for small documentation changes, navigate to the source on github and click the Edit button.
Follow the general coding style of the rest of the project:
2 space tabs
no trailing whitespace
inline documentation for new methods, class members, etc.
1 space between conditionals/functions, and their parenthesis and curly braces
if (..) {for (..) {while (..) {function(err) {Write tests and make sure they pass (tests are in the test directory).
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