Add config.yaml file exists check
repo.py: Delete existing package sources

When adding an updated package to a repo, this change will first delete all
existing package sources matching the name of the package in the repo/sources
directory.
Remove package.Packages() class and OrderedDict

This class has been replaced with a call to package.build_list() that returns
the package objects embedded in a plain old list.
Remove obj = package_obj
Disable automatic source hash updates for PKGBUILDs

Add the --update-sums argument to force update the source hashes. This makes it
so a developer knows when sources hashes are out of date. This gives them the
opportunity to manually check the hashes before updating the hashes in the
PKGBUILDs.
Add --no-update argument

If --no-update is used, the chroot root will not be updated. The chroot root is
updated by default when using the build command.
Implement --chroot-path and --chroot-copy arguments
Add '-f' argument to repo command
pbldr-0.3.0