add new sign_up page
moved email registration fields from devise/registrations to pages/sign_up
changed email address to immerwahrclara
add new sign_up link to header
skip internalization tests until we finish translations
changed production environment for Gmail
In production/staging : load the mail settings from the environment
Merge pull request #126 from rubymonsters/mh_sign_up_page

New sign up page, where user can choose whether to user twitter or email
hovering effect with grayscale