Add bison 2.6.4 to the list of supported versions
Merge branch 'PHP-5.3' into PHP-5.4
Make sure result is initilized

Practically this could only be an issue when overriding mysqlnd from
an extension, but makes static analysis happy
Merge branch 'PHP-5.4' into PHP-5.5

Conflicts:
	Zend/acinclude.m4
Merge branch 'PHP-5.5'