[ticket/11876] Move checksum generation from build PHP files to phing build.xml

This also removes paths from the checksum files.

PHPBB3-11876
[ticket/11876] Replace MD5 with SHA256.

PHPBB3-11876
[ticket/11879] Replace .live() with .on()

PHPBB3-11879
Merge remote-tracking branch 'cyberalien/ticket/11879' into develop-olympus

* cyberalien/ticket/11879:
  [ticket/11879] Replace .live() with .on()