Initial cut at composer extension.
Upgraded build pack utils to #dfc3d88.
Upgraded build pack utils to #047d28d.
Added test for composer extension.
Lots of updates to the composer extension.
Changed test to account for difference in installation command.
Merge branch 'master' into composer
Remove 'alpha' from composer version name, was breaking stuff.
Rolled back version change.
Prefix command with HOME.
Rewrite a temp copy of php.ini for use by composer.
Test fix with build pack utils.
Rolling back temp change.
Copy php.ini to tmp dir before rewriting it.
Cleaned up first working cut of composer extension.