added managing cron (including patched version of portsnap)
added optional static makefile and optionsdir
update README to reflect possible way of exporting poudriere environments as a pkgng repository
fixed syntax of README.md
sanity fix
refined cron PATHs
removed manageing portsnap
Merge pull request #11 from skoef/master

Cron support, example for exporting pkgng repo and some cleaning