fixed style of condition form
Changed option id field in condition
Added temp methods to condition to simulate old option field
Added options method and spec
added validation spec
Fixed and tidied pre-validation methods
Updated to_odk to work with multilevel.
Converted operator names to strings and refactored some things.
updated condition to_s method for multilevel
added option_path_to_rank_path to option node
added rank_path_to_option_path to option node
updated condition replication code to work for multilevel
moved rest of condition tests to spec, removed old stuff
abstracted cascading select view stuff out of response view
got condition form working with multilevel sets
added feature spec for condition creation and editing
fixed to_s for numeric conditions
refactored condition feature spec and added integer condition spec
fixed tests
reinstated option= method in condition