move matrix styles to tasks.css; fields with errors are now highlighted with errors
store typecasted arguments and arguments before typecasting; now one can validate numericality; specs for permission of params and submission of params
improve syntax of add_task_submission_param in order to yield value to a block when possible, specs added
when advanced options contain errors - show them expanded
validate pvalue and discretization
don't set matrix to default value if field is not empty on page load(e.g. on error during creation when #create renders action 'new')
small style fixes
motif matrix now have validation