Upgraded to build pack utils #82089ac.
Upgraded to build pack utils #9e67077
Upgraded build pack utils #1ee7835.
Upgraded version of PHP used by test.
Updated compile script to use the new builder syntax.  This allows for extensions to be registered and then installed separately.  The point of this is to allow the extensions to run prior to being installed and perhaps configure things.  One common use case of this is for extensions to influence the version or extensions enabled by PHP.
Added convenience script to run all tests.
Added __init__.py files.  These are technically required by Python to load an extension.  If an extension doesn't provide this file, it will be automatically added for the build pack.  Thus including it is optional.
Added some checks for the rewrite of php.ini.
Modifed extension to instruct the PHP extension to install the openssl extension.
Composer extension now pulls `ext-` requirements from the platform and
packages in composer.json and composer.lock.  These are converted to PHP
extension names by removing the `ext-` and are added to the list of
extensions that the build pack will install.

Extension version numbers from the composer files are ignored.  Build
pack always includes the latest version of an extension that was
available when PHP was compiled.
First draft of Composer docs.  More to come on this front.
Composer extension will now pull the PHP version out of `composer.json`
or `composer.lock` (`composer.json` is checked first).  If it's not
specified, it defaults to the version set by the build pack (i.e.
options.json).

The following syntax is supported for version numbers.

  - 5.3.* -> latest 5.4.x release (5.3, not supported)
  - >=5.3 -> latest 5.4.x release (5.3, not supported)
  - 5.4.* -> latest 5.4.x release
  - >=5.4 -> latest 5.4.x release
  - 5.5.* -> latest 5.5.x release
  - >=5.5 -> latest 5.5.x release
  - 5.4.31 (or some other specific release number) -> exact version
  - 5.5.15 (or some other specific release number) -> exact version
Added debug statement to list PHP version picked by composer extension.
Updated Composer docs with info about version.
Upgraded build pack utils to #7995200.
Upgraded build pack utils to #5fa8b91.
Switched from using check_output to stream_output.
Modified composer extension to stream to stdout.  Updated tests accordingly.
Updated configs to use WEBDIR & LIBDIR instead of hard coded htdocs and lib.
Upgraded build pack utils to #ca17602.