Change simplenode template files to work on more platforms

When developing Riak, we have found bugs and other issues due
to the number of platforms we support.

Here is an overview of the changes:
  -  Fix command-line syntax for commands to work on *BSD / Sun
  -  Add chkconfig and getpid to nodetool
  -  Replace platform specific 'kill' commands with a nodetool
	getpid method
  -  Fix RUNNER_USER settings to work on *BSD
rebar_core: document pre-dirs association
rebar_core: remove useless return after ?ABORT call
rebar_core: fix broken indentation
Update rebar repo urls
Merge pull request #55 from jaredmorrow/jem-simplenode-multi-platform

Change simplenode template files to work on more platforms
Remove unnecessary bar
Merge pull request #69 from tuncer/repo-url

Update rebar repo urls
Merge pull request #38 from tuncer/fix-sub_dir-association

rebar_core: fix sub dir association
Remove hg from integration tests; git is defacto standard at this point
Fix missing call to cwd_predirs