删除一个无用函数
解决yas与ac的tab键冲突
修改ac-use-overriding-map变量默认值
修正M-n M-p补全
Merge branch 'master' of github.com:EmingK/ac-improved

Conflicts:
	auto-complete.el
init of ac
追回expand_previous & expand_next
修正方向键回车换行