Edit user profile

As a user I want to be able to edit my profile.
Only authorised user can see the link and can enter to this page.
the user name can be used as a link, for example,
while an user sees the profile he should press change link/button to change this attributes.
Any of attributes can be changed except login.
please note, that the email should be unique.
To change password user must enter the old password.
Please also note that the content of none of password field is shown so to make sure the user have no mistake he should enter the new password twice.
User can leave this page or store changed.
While leave the confirmation about losing of changes is shown
If the user store the page all information should be validated. The validation is the