Show posts with markdown

Now, users can view posts with markdown

1. added the redcarpet gem to do markdown render
2. added a markdown helper method in application_helper
Added some validation on creating a post
Merge branch 'master' of heroku.com:secure-badlands-5737
Added a mailer for reseting password

when a user try to reset his/her password, a resetting email will be
sent to the users email
now users can receive an email to reset their password
added a testing email address
Now users can rest their passwords
moved the updating password into a new controller update_passwords_controller
Modified part of the password management layout
slight modification, the password saving problem still havent saved
simplified the redirect_to message
Did some code reconstruction
users now login with their email
changed the mailer address to sendgrid
nothnig