(REF#519) Enhancement: Allow developer to set FlashName and FlashSeperator values

Update router.go

Update beego.go - Slice types exist trap

To append a slice's value into "exceptMethod", for controller's methods shouldn't reflect to AutoRouter

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