Added -m, --metapkg option.

The -m, --metapkg option allows you to specified an alternate location for the METABUILD file.
Added -p, --pkgbuild option

The -p, --pkgbuild optionallows to use an alternative locaton for the PKGBUILD generated by metapkg
Merge pull request #3 from Darkhogg/master

Added options for METABUILD and PKGBUILD relocation