Updates and normalisation
Merge pull request #203 from GrahamCampbell/updates

Updates and normalisation
Normalize definition's name for 5.6.0RC1.
Add definition for 5.6.0RC2.
Test against 5.6.0RC2 on Travis.
Update run-tests.sh accordingly.
update most of the broken php urls

Unable to find good url replacements for:

http://downloads.php.net/stas/php-5.4.10RC1.tar.bz2
http://downloads.php.net/stas/php-5.4.1RC1.tar.bz2
http://downloads.php.net/stas/php-5.4.1RC2.tar.bz2
Merge pull request #1 from dwwoelfel/circle

php-build updates