Update to Author::CJM 4.31

  Release tests are now in xt/
  Reformat Changes to match spec
Add JPEG output formats

  Bump version to 0.03
Use /usr/bin/env perl
Document that PDF files are also acceptable input

  They always were acceptable; it just wasn't documented.
Mention -dJPEGQ=N
Mark formats added in 0.03
Updated Changes for March 15, 2014 release of 0.03