added mailing_list model and controller
added mailing_lists branch
added back database adapter name on admin/info
fixed: error when clicking "add" with no block selected on my/page_layout
tagged version 0.4.2
updated CHANGELOG for 0.4.2 release
fixed: crash on my/page_layout (trying to modify a frozen hash)
fixed: hide mail preference not saved (my/account)
show "no data" label when there's nothing to display on project member list
show "no data" label when there's nothing to display on changelog and roadmap
