Update beego.go - Slice types exist trap

Modify the file beego.go. 
Type GroupRouters all function 
Slice types exist trap bug.

Couchbase session provider

Conflicts:
	session/sess_file.go

NewBasicAuthenticator requires passing a second argument for Realm.

Change instructions for sqlite3 tests to use in memory db for much faster

httponly default true
seuce default not set

fix issue#521, return error when init redis session

Fix basic auth plugin example.

NewBasicAuthenticator requires passing a second argument for Realm.

add support for sql.Null* types, thx hobeone

Change instructions for sqlite3 tests to use in memory db for much faster

Update sess_file.go

Lock required to ensure the File sessions work correct.

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