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
php5*-gmagick: set path to graphicsmagick in configure script

Closes issue #1007