PledgeBank: Implement Manage Pledges screen

Elements:

• Search form elements:
  o Pledge: input text (returns hit if keyword found in any of the following fields: creator_name, creator_pledge_desc, signer_description_text, signer_pledge_desc)
  o Show only result: radio group
  + successful: radio option
  + failed: radio option
  + unselect: link removing selection from both above
  o Show only finished: checkbox
  o pledge due date from: show pledges where deadline is after this date
  o pledge due date to: show pledges where deadline is before this date
• List of pledges:
  o Title: (literally: "(creator_name) will (creator_pledge_desc) but only if (signers_limit) (signer_description_text) will (signer_pledge_desc).")
  o Id (civicrm_pb_pledge.id)
  o Signers limit (civicrm_pb_pledge.signers_limit)
  o Deadline (civicrm_pb_pledge.deadline)
  o Creator (display_name for civicrm_pb_pledge.creator_id)
  o Status: (successful|failed - as described in Pledge status chapter)
  o Active? (civicrm_pb_pledge.is_active)