Fix `luarocks path` now that luarocks.cfg no longer edits package.path
Make sure manifest unzips properly, to avoid stale manifests.
Add --force flag.
Should be useful for François Perrad's work on the BuildRoot infrastructure for LuaRocks.
fixed type. Fixes #185
Merge pull request #186 from Tieske/bad_underscore

fixed typo. Fixes #185