[Merge] lp:~xnox/upstart/user-log-dir into lp:upstart

[James Hunt]

Sounds good. Yes, please update the spec.

Please can you also update the doc as outlined in original comments. Also...

* init/xdg.c:
  xdg_get_cache_home(): XDG_CACHE_HOME and ".cache" should be defined in init/paths.h for consistency.
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https://code.launchpad.net/~xnox/upstart/user-log-dir/+merge/143091
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