Log Message:
Update to 1.0alpha4:

Changes since the alpha3 release:
  * first draft of the Theora I Format Specification
  * API documentation generated from theora.h with Doxygen
  * fix a double-update bug in the motion analysis
  * apply the loop filter before filling motion vector border in the reference frame
  * new utility functions: theora_packet_isheader(), theora_packet_iskeyframe(), and
    theora_granule_frame()
  * optional support for building without floating point
  * optional support for building without encode support
  * various build and packaging fixes
  * pkg-config support
  * SymbianOS build support