fixes #298, ldap email addresses created by rhodecode automatically during first login didn't get converted to lower case, which lead to lookup failures and than wrong checks for uniqueness. Fixed that by putting a setter on db model column that will enforce converting to lowercase.

syntax: glob
*.pyc
*.swp

syntax: regexp
^build
^docs/build/
^docs/_build/
^data$
^\.settings$
^\.project$
^\.pydevproject$
^rhodecode\.db$
^test\.db$
^repositories\.config$
^RhodeCode\.egg-info$