Only check WOW64 process when system architecture is x64.

Fixes https://github.com/opscode/chef/issues/1549
add a comment about incompatible architectures
Merge pull request #1560 from opscode/sersut/chef-1549

Only check WOW64 process when system architecture is x64.
Allow users to set the +resource_name+ in an LWRP programatically

Previously this was marked as an internal API, but I am making it public. We
are reliably using this API in our LHWRPs in Release Engineering and it is
truly a delightful experience.

This deprecates using +resource_name = :foo+ in favor of the more "Chef-like"
+resource_name(:foo)+.