Bump to PHP 5.4.25
Move php53, php54, php55 to using abstract-php-version

Thank to @greenantdotcom for starting this with php56
Override the plist filename

Fixes #663
Update abstract classes to always return a version, in order to allow brew uses to work

Fixes #768
add php5*-redland 1.0.16.1

Fixes issue #776
Add with-pdo-oci option to php5*

Fixes issue #813
Fix php5*-xhp build fails with clang

Fixes issue #873
Fix phpsh

Closes issue #995
Patch phpsh to make it usable

Closes #966
remove 32-bit option

closes #956
Fix php5*-spl-types

Closes #981
Add Envoy
Update Ioncube to 4.5.3 for all versions of php
Bump php56 to 5.6.0alpha2
Update PHPUnit to v3.7.30
Add 'deps' and 'requirements' methods to abstract classes
PHP CodeSniffer: Preserve config file on upgrades.
Adapt to recent change in drush formula.

Drush will now pick up the installed drush command automatically.

Offer an option to not have the command installed.
Add dependencies for --HEAD to abstract-php class

Closes issue #732
php53: fix issue with using --with-thread-safety

closes issue #962