Update geeklog to 1.8.2.1 (Geeklog 1.8.2sr1).

Geeklog History/Changes:

Feb 19, 2013 (1.8.2sr1)
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This release addresses the following security issues:
- High-Tech Bridge Security Research Lab reported an XSS in the calendar_type
  parameter in the Calendar plugin (HTB23143).
- Trustwave Spiderlabs reported XSS in the install script, the Configuration,
  as well as in the Admin interfaces for the Polls plugin and the Topic editor
  (TWSL2013-001).

Not security-related:
- Fixed Twitter OAuth login by switching to version 1.1 of the Twitter API
  (feature request #0001506).

(taca)