fix mistype in converge for deploy#copy_cached_repo
CHEF-4927 - coerce group GID to string

To remain consistent with the way the user provider works, coerce both
new_resource and current_resource GIDs to strings for comparison. This
allows users to write their resources like:

group "zone" do
  gid 233
end

or

group "zone" do
  gid "233"
end

Without this change, every time Chef runs when a string GID is
specified, it will modify the group, which is not desirable.
[CHEF-4799] Handle non-dupable elements when duping attribute arrays
[CHEF-4946] Don't try to install ruby-shadow on cygwin
Merge branch 'master' of github.com:valodzka/chef into CHEF-4929
Info for CHEF-4929.
Merge branch 'jtimberman/CHEF-4927' into contributions-cc-51
Info for CHEF-4927.
Merge branch 'CHEF-4799' of github.com:criteo/chef into contributions-cc-51
Info for CHEF-4799.
Merge branch 'CHEF-4946' of github.com:criteo/chef into contributions-cc-51

Conflicts:
	Gemfile
Info for CHEF-4946.
Merge pull request #1299 from opscode/contributions-cc-51

CC-51: Merging Chef Contributions.