v0.18.2 - Opensuse, a #cmd_dir fix, OS X build tools.
v0.18.2 - Opensuse, a #cmd_dir fix, OS X build tools.

* Basic opensuse/zypper support thanks to Robert Warmbier.
* A fix for #cmd_dir; directories were recognised as commands when their
  names matched. Thanks to Chris Heisterkamp.
* The 'xcode build tools' dep now tolerates gcc being installed in a
  separate location to the rest of the toolchain, to account for the
  case where it's installed separately via homebrew.

[My release deps played up, and created 0.18.1 directly on top of
0.18.0 without incorporating these changes. This version fixes that, and
merges the erroneous 0.18.1 commit so that 'stable' can fast-forward.]

victorklos/babushka,victorklos/babushka,victorklos/babushka