Support for Carton and prebuilt extrenal deps
Convert config vars to absolute paths
Merge changes from miyagawa and doug1
keep cpanm build.log
Use LOCALURL to specify location of vendored libs.
install modules listed in local.bundle before installdeps
support for /app/vendor binaries
Merge branch 'master' of git://github.com/miyagawa/heroku-buildpack-perl into miyagawa-master
use absolute path for lib
bin/release: modify lib directory
update bin/release
restore cached assets incrementally to avoid full rebuild after a heroku fork
support pre_compile and post_compile hooks
Merge remote-tracking branches 'miyagawa/master', 'islue/master' and 'sugyan/master'
use bash
do carton install (deployment mode, cached) if cpanfile.snapshot is present
document vulcan usage