started sessions controller implementations by myself
added sessions controller with needed actions
added new and destroy templates (new is filled partially)
routes updated to route signin and signout
andded rendering 'new' to 'create' action, added 'index' action by myself for creating page for observing currently logged in users by admin
'sign in' link in header now properly leads to 'sign in' page
sessions.new view filled with structure
added :index symbol to 'only' list for sessions
added tests for sign in page
added sessions_helper requare to app controller
sessions controller now processes failed login (with flashing error), added signing in startup
added sessions_helper (empty now, just to app work fine, its report 'no such helper' otherwise)
added migration for adding remember_token to users table
added test for user model: respond to temember_token
added test for flashing error on failed sign in
sign in/out now works, tests are pass, exercises ain't done yet
exercise1 is done:
form_for for sign in is replaced with form_tag
second exercie (capybara related) is skipped
chapter8 finished