Allow plugins to modify outgoing group invitation notifications
Revert "Allow plugins to modify outgoing group invitation notifications"

This reverts commit b08166c9cdb05eb71b8dcb50514027a0f8410c0e.
fix hook/type params
Merge pull request #36 from beck24/notification_hooks

Allow plugins to modify outgoing group invitation notifications
override group search behaviour to find groups on all profile fields
fixed: layout issue in plugin settings
added: plugin setting to indicate if a group is hidden
changed: hidden indicator to entity menu item and more options in the
plugin settings
small bug fix
line endings
file and function documentation
fixed: you can no join groups you were invited for on the group profile
page
applied Elgg coding standards
Added "my groups" listing
Making it possible to select group default notification types
Merge pull request #39 from cdauth/1

Making it possible to select group default notification types
Merge pull request #37 from cdauth/master

Added "my groups" listing
fixed: tag filter should be case insensitive
fixed: misleading translation for a group cleanup setting (#22)
fixed: create group button showing up on some pages when setting was
disabled (#35)