Update sess_file.go

Lock required to ensure the File sessions work correct.

fix: added nil check on c.CruSession to prevent crash

Fix spelling mistake

Fix the spelling mistake of error page.

add comments for testing, utils and validation packages

EnableReander default is true.

add comments for session and toolbox package

fix bug, redis session doesnt work

fixed bug: in logs package check if platform is windows

orm 1. add api: NewOrmWithDB, AddAliasWthDB; 2. RawSeter -> add api: RowsToMap, RowsToStruct; 3. RawSeter -> change api: Values, ValuesList, ValuesFlat add optional params comumns.

* regenerate sid, if the old key doesn't exists, set the new one directly

Add a ReadOrCreate method:

m := &User{Name: "Kyle"}
// Returns a boolean indicating whether the object was created,
// the primary key of the object, or an error.
created, id, err := orm.ReadOrCreate(m, "Name")

diffrent level logs display diffrent color

add comments for orm and middleware packages.

merge develop