Update sidebarintro.html

Fixed link to the issue tracker
Merge pull request #128 from vkotovv/develop

Fix issue tracker link
Fix `install_requires` in setup.py
Merge branch 'develop' of github.com:mattupstate/flask-security into develop
Update CHANGES
Bump version number to 1.6.6
Make password length message configurable.
remove '@anonymous_user_required' from confirm_email()
add logout_user() to the beginning of confirm_email()
Merge pull request #134 from rxl/email_confirmation_fix

Email confirmation fix
Conditionally logout the current user when confirming an email address to prevent unnecessary code/signals to be fired. Fixes #133
Update CHANGES
Set release date.
Bump version number to 1.6.7
Update docs. Fixes #137
A little more documentation. Fixes #131
Docs polish
Clean up
PEP8 polish
PEP8 and general clean up on tests