Fix submodule entry
5.5.1 release
5.4.18 RC1
add 5.4.16 to archive
Northeast PHP Technical Conference
Ski PHP 2014
Logo for Ski PHP
Merge branch 'master' into responsive

* master:
  Logo for Ski PHP
  Ski PHP 2014
  Northeast PHP Technical Conference
  add 5.4.16 to archive
  5.4.18 RC1
  5.5.1 release
  Fix submodule entry