Add `getpid` command to nodetool and add missing options

Adds `getpid` as a way to get the PID of the running node.  This
also options that were missing from the usage text.

Supports #251
Use erlang `os:getpid` as basis of `riak stop`

In BSD systems the regular expression was failing that attempted
to capture the PID of the running Riak node.  This PID was used
in the `riak stop` command to properly wait for a node to stop.

This change fixes the situation by replacing the fragile shell
methods of getting the PID with an erlang / nodetool based
method.  In addtion a `riak getpid` function has been added
for general admin use.

Addresses #251
Merge pull request #251 from basho/gh251-riak-stop-bsd

`riak stop` does not behave properly on BSD systems
Properly exit on `/etc/init.d/riak status` command

When running `/etc/init.d/riak status`, if the status fails
(Riak isn't running) not only should a message print out
that states that fact, but also the exit status should be non-zero.

This change addresses issue basho/riak#232 for RPM packages.
Merge pull request #253 from basho/jem-rpm-package-init-status

Properly exit on `/etc/init.d/riak status` command
Update README with new docs URL
Remove outdated files listed in README
Add syslog support for lager to riak
remove mapred_queue_dir configuration

This should have gone away with the removal of Luke.
remove legacy-mapred-only configs

These should have been removed when Luke was removed.
Merge pull request #259 from branch 'bwf-remove-mapred_queue_dir'
Add riak-admin aae-status command
Add AAE options to app.config
Merge pull request #261 from basho/jdb-aae-info

Add 'riak-admin aae_status', plus add AAE options to app.config
add health check config options to app.config
Merge branch 'jrw-health-check-config'
Roll version 1.3.0 pre-release 1
Fix dependency on lager_syslog to get correct lager