improved dev lists view

Improved lists view by replacing class-based view to a more
flexible view suggested by tampakrap and mgorny.
add per-view caching on lists

Added a per-view caching to lists which reliefs server
from HTTP requests and improves performance.
Reuse @require_POST decorator from django.
Add @strong_auth_required decorator.

And support re-login with @strong_auth_required.
Merge pull request #65 from mgorny/strong-auth-decorator

@strong_auth decorator
Merge pull request #63 from dastergon/improve_lists_view

Improved and added per-view caching on lists
Use LDAP as secret backend for OTP.
Merge pull request #66 from mgorny/otp-ldap

Use LDAP as secret backend for OTP.
add url tag to templates

Using url tag the templates become more portable and respect the DRY
principle.
rename accounts_lists view to lists
Merge pull request #67 from dastergon/url_tag

add url tag to templates
update models with the new attributes

New attributes:
1) gentooPlanetFeed - Link to developer's rss feed to planet(future use)
2) gentooUniverseFeed - Link to developer's rss feed to universe(future use)
3) website - User's website, weblog, etc.
Merge pull request #68 from dastergon/new_attributes

update models with the new attributes