parse for github.com replace  the . to _
fix #759
support #761

type Test struct {
    Date    time.Time    `form:"Date, 2006-01-02"`
    Save    bool            `form:"Save"`
}
add test case fot date & stringbool
fix #620 simple the sessionID generate
Merge branch 'develop' of https://github.com/astaxie/beego into develop
simple the session
simple the session init
update the test case
change 1.4.1 to 1.4.2