Update libyaml to 0.1.6
Merge pull request #553 from pyhalov/libyaml

Update libyaml to 0.1.6
system-tools-backends: fix perl dependency
Merge pull request #554 from pyhalov/gnome-system-tools

system-tools-backends: fix perl dependency
graphviz: always build php module for 5.4 version
Update php-54 to 5.4.26
Update php 5.5 to 5.5.11
Merge pull request #555 from pyhalov/php

Php
Update php extensions to php 5.4.26, 5.5.11
Merge pull request #556 from pyhalov/php

Update php extensions to php 5.4.26, 5.5.11