Copy 1.4 to 1.5
Rename 1.4 to 1.5 in includes
Wipe 1.4 release notes
Add sprint 20 release notes
Updated LDAP docs/added info about avatars
Add deb plugin repo notes to 1.5
Auth filters and 1.5

Regular user roles permissions
Add sprint 21 release notes
Add 1.5 link to menu
Merge branch '1.5-wip' into gh-pages