Remove broken APC formula for PHP55. Closes #614
Updated phpunit formula to use versioned url

I've changed the phpunit formula to use the versioned url (since I was getting sha1 mismatch) and also updated version to 3.7.22
Upgrade php5*-http and php5*-pthreads
Fixed phpunit version problem with executable after download

I've fixed the versioned filename issue due my last commit with the versioned url
imagick: Added patch for the header file MagickWand.h could not be located error during ./configure
Replace errant use of 'throw' with 'raise'

In Ruby, throw/catch is not related to exceptions, and without an catch clause somewhere up the stack, this will fail with "uncaught throw".

Replace it with a plain "raise" which will re-raise the current exception.
Release 2.0.0b7
opcache 7.0.2 update PHP 5.4/5.5
APCu v4.0.1
Add extension YAC (Yet Another Cache, developed by Xinchen Hui - laruence)
Fixed composer requirements for PHP55