Fixed tests to account for changes from 5.4.26 to 5.4.27, php-cgi was moved into it's own package.
Created binary folder structure that supports multiple stacks.  Moved index files into their stack.
Updated options.json to include the stack in the download url.  Modified binaries generate script to use a FormattedDict, which properly handles the stack.
Updated indexes to support different stacks.
Added index files for precise binaries.
Changed URL for DropBox downloads.
Fixed tests to work with addition of stack in the download URL.
Fix to override php.ini at runtime.
Updated index files due to changes in directory structure on DropBox.
Modified 'binaries generate' to have a --stack option.  This allows for overriding the stack specfied in the defaults/options.json file.
Upgraded to PHP 5.4.28 and PHP 5.5.12.
Upgraded to NewRelic 4.8.0.47.
Fixed up tests after change to set php.ini location at runtime.
Fixed NewRelic extension to pull the application name from VCAP_APPLICATION rather than VCAP_SERVICES (was using service name, now uses app name). Fixed test to check this correctly.
Fixed script to use new service name, which no longer has -n/a on the end.  Fixed tests to account for this change.
Removed old versions of PHP.  Only maintaining latest three versions.
Updated indexes for lucid and precise binaries.
Upgraded build pack utils to #d845f6c
Bug: ZEND_EXTENSIONS path was using `@{HOME}` which was resulting in
`{HOME}` being replaced and the `@` remaining.  Just using `@HOME`, is
sufficient in this case and it prevents FormattedDict from replacing the
`{HOME}` too early.
Updated build pack utils to #a9a6468.