Remove 'when' field from Idea forms and views. closes #69.
add expiration field to thread view. see #70
Simplify thread saving. Doesn't create idea automatically
Fixing saving of votes for new threads.
further simplifying new and edit actions for threads and ideas
removing text-bindings from idea_thread_view to prevent idea title changing.
Merge pull request #73 from cremalab/remove-when-69-rb

IdeaThreads refactor