Better copy
Enable extensions in builds
Make document root overridable for symfony apps
Add rudimentary handling of PHP version constraints
Remove support for wildcard versions again, will be added through a real parser for Composer expressions
Add Mongo, Redis, BCmath and EXIF extensions to PHP, enable extensions in the package's INI files
Merge pull request #29 from CHH/development

Merge development to master
Merge branch 'master' of https://github.com/CHH/heroku-buildpack-php