Fix displaying of user status

Summary:
This fixes two separate issues:

1. getTextStatus() is used for machine readable data in handles and user.info method. Broken since D3810.
2. Status may contain date. Broken since beginning but masked by the fact that CSS ignores unknown class names.

Test Plan:
Displayed revision with reviewer away.
Called user.addstatus.
Edited status in calendar.

Reviewers: btrahan, epriestley

Reviewed By: epriestley

CC: nh, aran, Korvin

Differential Revision: https://secure.phabricator.com/D4275