Optimize some modules
Sun Feb 17 20:53:42 2013 Ji WenCong <whs_jwc@163.com>
	* Optimize for empty string, zero-integers and zero-fractions.
	* Stable channel: 1.0.728.2 => 1.0.728.3

Sun Feb 17 10:15:20 2013 Ji WenCong <whs_jwc@163.com>
	* Optimize polynomial module: removed sortOut() function.