just something to start off with on a new branch for our member area

took something from the ticketing branch which already partly
integrated a member area
improved the main css file using lots of mixins

added a new class for prettier tables
made use of it in the members table
create, edit and delete members, some css optimizations
member accounts can be activated

members can edit their own info
added members navi
added login button, adjusted login form, moved login form to members namespace, fixed wrong member controller folder
merge from master
added main members page

list of dates which admins can create and edit
added navigation bar for admins
improved admin action buttons

css fixes
other fixes
fixed faulty password validation in member model

improved form labels and flash messages
member activation

member gets logged in after activation
activation code gets set when a member is created
added activation mail

action mailer sends an activation mail to newly created members
member model

added birthday attribute
made email attribute optional
improved error messages
moved mail sending procedure to model
added rake tasks for members

task to import members from csv
task to send all activation mails for unactivated members
export member dates to iCal
added files to member area
Merge branch 'members'