minor configuration changes

[maorhayoun]

unicorn pid file should be placed at shard path location by default.
unicorn execution should use the unicorn_environment directly (and if not set, use the app_env fallback)

happy to be corrected otherwise

[aspiers]

Thanks for the report.

You are right that the pid file should usually be within the shared/ directory, however I think autodetection as described in #7 is a much better approach for the reasons I mentioned there.

Your other change is not quite right - see #70 for what I believe is the correct solution.

Therefore I suggest closing this PR in favour of #7 and #70.

[maorhayoun]

no argument about autodetection of pid path as the correct solution,
but as I see it, if no specific override is done to indicate different none-the-usual path for the pid file -
default path should still be valid

[aspiers]

Agreed, and that's why I added ed30b08 to #70 which will take care of this.

[aspiers]

Actually I just remembered that capistrano already automatically sets up a symlink from #{current_path}/tmp/pids to #{shared_path/tmp/pids} by default, so ed30b08 is unnecessary...