adapt to rails 4
options order randomization setting in multiple and single choice fields
add install generator and admin controllers authentication method
add XLS exports
only allow one attempt per browser or ip_address
integrate layout and some flash messages
add custom partials to questions
add question indexes
implementing -other- field in matrixes
other field in matrixes
fix js validation errors handling
force ordering questions and options by id for now, reordering not implemented yet...
force ordering sections by id too...
do not randomize options when not asked to
support selects for choosable fields in js
fix branch rules handling for answers_option condition type in choosable and matrix fields
fix choosable options order randomization and add matrix sub questions order randomization
show help text at the top of matrixes, do not let users edit a completed attempt
dont force users to choose another item if they select other in choosable options
sanitize html tags from column headers in exports